PCAP- programing Essentials in Python

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1. The following code: print(float("1.3"))

1.3

The following code prints: x = "\\\\" print(len(x))

1. What will be the output of the following code? class A: X = 0 def __init__(self,v = 0): self.Y = v A.X += v a = A() b = A(1) c = A(2) print(c.X)

1. What is the output of the following snippet? def fun(inp=2,out=3): return inp * out print(fun(out=2))

What is the output of the following snippet? def fun(x,y,z): return x+2*y+3*z print(fun(0,z=1,y=3))

1. What will be the output of the following snippet? try: raise Exception except: print("c") except BaseException: print("a") except Exception: print("b")

it will cause an error

1. UNICODE is a standard:

like ASCII, but much more expansive

1. UTF‑8 is:

· a form of encoding Unicode code points

ASCII is:

· short for American Standard Code for Information Interchange

The \n digraph forces the print() function to:

Break the output line

1. The following code print('Mike' > "Mikey") prints:

False

1. What will be output of the following code? class A: A = 1 def __init__(self): self.a = 0 print(hasattr(A,'a'))

False

1. What will be the output of the following snippet? class X: pass class Y(X): pass class Z(Y): pass x = X() z = Z() print(isinstance(x,Z),isinstance(z,X))

False True

1. What will be the output of the following snippet? def fun(d,k,v): d[k]=v dc = {} print(fun(dc,'1′,'v'))

None

Priority

Priority Operator 1 => +, - => unary 2 => ** 3 => *, /, //, % 4 => +, - => binary 5 => <, <=, >, >= 6 => ==, !=

The meaning of the keyword parameter is determined by:

The argument's name specified along with its value.

1. The package directory/folder may contain a file intended to initialize the package. Its name is:

__init__.py

1. The following snippet: def f(par2,par1): return par2 + par1 print(f(par2=1,2))

is erroneous

1. The following line of code: for line in open('text.txt','rt'):

is valid as open returns an iterable object

1. If there is a finally: branch inside the try: block, we can say that:

it will always be executed

1. What will be the output of the following snippet? try: raise Exception except: print("c") except BaseException: print("a") except Exception: print("b")

it will an cause error

1. What will be the result of executing the following code? def I(n): s = " for i in range(n): s += '*' yield s for x in I(3): print(x,end=")

it will print ******

1. What will be the result of executing the following code? def I(n): s = '+' for i in range(n): s += s yield s for x in I(2): print(x,end=")

it will print +

1. What will be the effect of running the following code? class A: def __init__(self,v): self._a = v + 1 a = A(0) print(a._a)

it will print 1

1. What will be the result of executing the following code? class A: def a(self): print('a') class B: def a(self): print('b') class C(A,B): def c(self): self.a() o = C() o.c()

it will print a

1. What will be the result of executing the following code? class A: def a(self): print('a') class B: def a(self): print('b') class C(B,A): def c(self): self.a() o = C() o.c()

it will print b

1. What will be the result of executing the following code? def a(x): def b(): return x + x return b x = a('x') y = a(") print(x() + y())

it will print xx

1. What will be the effect of running the following code? class A: def __init__(self,v): self.__a = v + 1 a = A(0) print(a.__a)

it will raise an AttributeError exception

1. Which of the following sentences is true? nums = [1,2,3] vals = nums[-1:-2]

nums is longer than vals

1. Assuming that the open() invocation has gone successfully, the following snippet will: for x in open('file','rt'): print(x)

read the file line by line

1. If you want to tell your module's users that a particular variable should not be accessed directly, you may:

start its name with _ or __

1. The sys.stderr stream is normally associated with:

the screen

1. The sys.stdout stream is normally associated with:

the screen

If you want to write a byte array's content to a stream, you'd use:

the write() method

1. How many hashes will the following snippet send to the console? lst = [[x for x in range(3)] for y in range(3)] for r in range(3): for c in range(3): if lst[r][c] % 2 != 0: print("#")

three

1. The Exception class contains a property named args, and it is a:

tuple

1. What will be the output of the following piece of code? x = 16 while x > 0: print('*',end=") x //= 2

*****

1. What is the output of the following snippet? x=1 y=2 z=x x=y y=z print(x,y)

2 1

1. What will be the output of the following snippet? l = [1,2,3,4] l = list(map(lambda x: 2*x,l)) print(l)

2 4 6 8

1. What is the output of the following piece of code if the user enters two lines containing 2 and 4 respectively? x=float(input()) y=float(input()) print(y ** (1/x))

2.0

The value twenty point twelve times ten raised to the power of eight should be written as

20.12E8

1. What is the output of the following snippet? dct = {} dct['1'] = (1,2) dct['2'] = (2,1) for x in dct.keys(): print(dct[x][1],end="")

1. What is the output of the following snippet? def any(): print(var + 1,end=") var = 1 any() print(var)

What will be the output of the following piece of code: y=input() x=input() print(x+y) if the user enters two lines containing 1 and 2 respectively?

1. What is the output of the following snippet if the user enters two lines containing 2 and 4 respectively? x=input() y=input() print(x+y)

1. What will be the output of the following piece of code? v = 1 + 1 // 2 + 1 / 2 + 2 print(v)

3.5

1. What is the output of the following snippet? def fun(x): x += 1 return x x = 2 x = fun(x+1) print(x)

1. What is the output of the following snippet? def f(x): if x == 0: return 0 return x + f(x - 1) print(f(3))

1. An operator able to check whether two values are equal, is coded as:

1. The None keyword designates:

A None value

1. What will be the output of the following piece of code? x, y, z = 3, 2, 1 z, y, x = x, y, z print(x,y,z)

1 2 3

1. What will be the output of the following snippet? d = { 'one':1, 'three':3, 'two':2 } for k in sorted(d.values()): print(k,end=' ')

1 2 3

1. What will be output of the following code? class A: def __init__(self,v = 2): self.v = v def set(self,v = 1): self.v += v return self.v a = A() b = a b.set() print(a.v)

1. What will be the output of the following code? class A: A = 1 def __init__(self,v = 2): self.v = v + A.A A.A += 1 def set(self,v): self.v += v A.A += 1 return a = A() a.set(2) print(a.v)

1. What is the output of the following snippet? T = [[3-i for i in range (3)] for j in range (3)] s = 0 for i in range(3): s += T[i][i] print(s)

Python is a dynamically-typed language, which means you don't need to declare variables in it

To assign values to variables, you can use a simple assignment operator in the form of the equal (=) sign, i.e., var = 1.

1. The following code print(chr(ord('z') - 2)) prints:

1. The top‑most Python exception is named:

· BaseException

1. The following code print(3 * 'abc' + 'xyz') prints:

· abcabcabcxyz

1. The following code: print(float("1,3"))

· raises a ValueError exception

How many elements does the L list contain? L = [i for i in range(-1,2)]

· three

1. The following statement: assert var == 0

· will stop the program when var == 0

1. What is the output of the following piece of code if the user enters two lines containing 3 and 2 respectively? x=int(input()) y=int(input()) x = x % y x = x % y y = y % x print(y)

1. What is the output of the following snippet? def fun(x,y): if x == y: return x else: return fun(x,y-1) print(fun(0,3))

1. What will be the output of the following piece of code? d = { 1:0, 2:1, 3:2, 0:1 } x = 0 for y in range(len(d)): x = d[x] print(x)

1. What will be the output of the following snippet? print(len([i for i in range(0,-2)]))

1. How many empty lines will the following snippet send to the console? l = [[c for c in range(r)] for r in range(3)] for x in l: if len(x) < 2: print()

1. What will be the output of the following snippet? d = {} d['2'] = [1,2] d['1'] = [3,4] for x in d.keys(): print(d[x][1],end="")

1. What will be the output of the following snippet? t = (1, 2, 3, 4) t = t[-2:-1] t = t[-1] print(t)

1. After execution of the following snippet, the sum of all vals elements will be equal to: vals = [0, 1, 2] vals.insert(0,1) del vals[1]

1. What is the output of the following snippet? def fun(inp=2,out=3): return inp * out print(fun(out=2))

1. What is the output of the following snippet? def fun(x): global y y = x * x return y fun(2) print(y)

1. What value will be assigned to the x variable? z = 2 y = 1 x = y < z or z > y and y > z or z < y

True

1. What will be the output of the following code? class A: A = 1 def __init__(self): self.a = 0 print(hasattr(A,'A'))

True

1. What will be the output of the following code, located in file p.py? print(__name__)

__main__

1. What is the output of the following piece of code? print("a","b","c",sep="sep")

asepbsepc

1. What will be the result of executing the following code? def o(p): def q(): return '*' * p return q r = o(1) s = o(2) print(r() + s())

it will print ***

1. What will be the result of executing the following code? class A: pass class B: pass class C(A,B): pass print(issubclass(C,A) and issubclass(C,B))

it will print True

1. What will be the result of executing the following code? class A: def __init__(self): pass a = A(1) print(hasattr(a,'A'))

it will raise an exception

1. If s is a stream opened in read mode, the following line q = s.readlines() will assign q as a:

list

1. If there are more than one except: branches after the try:, we can say that:

not more than one try: block will be executed

1. If the class constructor is declared as below, which one of the assignments is valid? class Class: def __init__(self): pass

object = Class()

1. The compiled Python bytecode is stored in files having names ending with:

pyc

1. If s is a stream opened in read mode, the following line will: q = s.read(1)

read 1 character from the stream

1. The following statement: assert var != 0

will stop the program when var != 0

1. An operator able to check whether two values are not equal is coded as:

· !=

1. Left‑sided binding determines that the result of the following expression

· 0

What will the output of the following snippet? a = 1 b = 0 a = a ^ b b = a ^ b a = a ^ b print(a,b)

· 0 1

1. An operator able to check whether two values are equal is coded as:

· ==

1. If there is a superclass named A and a subclass named B, which one of the presented invocations should you put instead of a comment? class A: def __init__(self): self.a = 1 class B: def __init__(self): # put selected line here self.a = 2

· A.__init__(self)

1. Which of the following statements is false?

· The None value may not be used outside functions

1. One of the following variables' names is illegal - which one?

· True

1. The value eventually assigned to x is equal to: x = 1 x = x == x

· True

1. What value will be assigned to the x variable? z = 0 y = 10 x = y < z and z > y or y > z and z < y

· True

1. What value will be assigned to the x variable? z = 10 y = 0 x = y < z and z > y or y > z and z < y

· True

1. What will be the output of the following code? class A: A = 1 print(hasattr(A,'A'))

· True

1. What is the output of the following snippet? list = [x*x for x in range(5)] def fun(L): del L[L[2]] return L print(fun(list))

· [0, 1, 4, 9]

1. What is the output of the following snippet? l1 = [1,2,3] for v in range(len(l1)): l1.insert(1,l1[v]) print(l1)

· [1, 1, 1, 1, 2, 3]

1. What is the output of the following snippet? l1 = [1,2] for v in range(2): l1.insert(-1,l1[v]) print(l1)

· [1, 1, 1, 2]

1. What is the output of the following snippet? lst = [1,2,3,4] print(lst[-3:-2])

· [2]

1. What is the output of the following snippet? l1 = [1,2,3] l2 = [] for v in l1: l2.insert(0,v) print(l2)

· [3,2,1]

1. A predefined Python variable, storing the current module name, is called:

· __name__

The print() function can output values of:

· any number of arguments (including zero)

1. If you want to open a text file in append mode, you would use the following mode string:

· at

1. A built‑in function is a function which:

· comes with Python, and is an integral part of Python

1. The pyc file contains:

· compiled Python code

1. Which of the following lines properly starts a parameter less function definition?

· def fun():

1. Knowing that a function named fun() resides in a module named mod, choose the proper way to import it:

· from mod import fun

1. Which of the following lines improperly invokes the function defined as: def fun(a,b,c=0) Choose all that apply.

· fun(b=1): · fun(a=0,b=0):

The result of the following division

· is equal to 1.0

1. The following snippet: def func(a,b): return a ** a print(func(2))

· is erroneous

1. The following snippet: def func(a,b): return b ** a print(func(b=2,2))

· is erroneous

1. Assuming that the tuple is a correctly created tuple, the fact that tuples are immutable means that the following instruction: tuple[1] = tuple[1] + tuple[0]

· is illegal

1. What will be the result of executing the following code? def I(n): s = '+' for i in range(n): s += s yield s for x in I(2): print(x,end=")

· it will print ++++++

What will be the result of executing the following code? class A: def __str__(self): return 'a' class B(A): def __str__(self): return 'b' class C(B): pass o = C() print(o)

· it will print b

1. What will be the result of executing the following code? def f(x): try: x = x / x except: print("a",end=") else: print("b",end=") finally: print("c",end=") f(1) f(0)

· it will print bcac

1. What will be the result of executing the following code? class Ex(Exception): def __init__(self,msg): Exception.__init__(self,msg + msg) self.args = (msg,) try: raise Ex('ex') except Ex as e: print(e) except Exception as e: print(e)

· it will print ex

1. What will be the effect of running the following code? class A: def __init__(self,v): self.__a = v + 1 a = A(0) print(a.__a)

· it will raise an AttributeError exception

1. What will be the result of executing the following code? class A: def __init__(self): pass a = A(1) print(hasattr(a,'A'))

· it will raise an exception

1. The meaning of a positional argument is determined by:

· its position within the argument list

1. The sys.stdin stream is normally associated with a:

· keyboard

1. The readlines() method returns a:

· list

1. A function defined in the following way: def function(x=0): return x

· may be invoked without any argument, or with just one

1. Knowing that a function named fun() resides in a module named mod, and it has been imported using the following line: import mod choose the way it can be invoked in your code:

· mod.fun()

1. The unnamed except: block:

· must be the last one

1. Take a look at the snippet and choose the true statement: nums = [1,2,3] vals = nums del vals[:]

· nums and vals are different names of the same list

Take a look at the snippet, and choose the true statement: nums = [1,2,3] vals = nums del vals[1:2]

· nums and vals are of the same length

1. Which of the following sentences are true? Choose all that apply. nums = [1,2,3]vals = nums

· nums is longer than vals · nums and vals are different names of the same list

1. If the class's constructor is declared as below, which one of the assignments is valid? class Class: def __init__(self): pass

· object = Class()

The ** operator

· performs exponentiation

1. What code would you insert into the commented line to obtain the output that reads: a b c Code: dct = { } lst = ['a','b','c','d'] for i in range(len(lst) - 1): dct[lst[i]] = ( lst[i], ) for i in sorted(dct.keys()): k = dct[i]# insert your code

· print(k[0])

1. If s is a stream opened in read mode, the following line q = s.read(1) will:

· read 1 character from the stream

1. Assuming that the open() invocation has gone successfully, the following snippet will: for x in open('file','rt'): print(x)

· read the file line by line

1. If you want to fill a byte array with data read in from a stream, you use the:

· readinto() method

The second assignment: vals = [0, 1, 2] vals[0], vals[2] = vals[2], vals[0]

· reverses the list

Only one of the following statements is false - which one?

· the result of the / operator is always an integer value

What is the output of the following snippet? list = ['Mary', 'had', 'a', 'little', 'lamb'] def list(L): del L[3] L[3] = 'ram' print(list(list))

· the snippet is erroneous

What is the output of the following snippet? L = [[0, 1, 2, 3] for i in range(2)] print(L[2][0])

· the snippet will cause a runtime error

1. What is the output of the following snippet? x = 2 + 3 * 5. print(X)

· the snippet will cause an execution error

1. How many stars will the following snippet send to the console? i = 0 while i < i + 2 : i += 1 print("*") else: print("*")

· the snippet will enter an infinite loop

1. The fact that tuples belong to sequence types means:

· they can be indexed and sliced like lists

1. How many hashes will the following snippet send to the console? var = 0 while var < 6:var += 1 if var % 2 == 0: continue print("#")

· three

1. The strerror function comes from the OS module, and it's designed to:

· translate an error number into an error description

1. How many stars will the following snippet send to the console? i = 0 while i <= 3 : i += 2 print("*")

· two

1. What is the output of the following snippet? dct = { 'one':'two', 'three':'one', 'two':'three' } v = dct['one'] for k in range(len(dct)): v = dct[v] print(v)

· two

How many hashes will the following snippet send to the console? for i in range(1): print("#") else: print("#")

· two

1. The following snippet: def func1(a): return None def func2(a): return func1(a)*func1(a) print(func2(2))

· will cause a runtime error

1. The following snippet: def func1(a): return a ** a def func2(a): return func1(a)*func1(a) print(func2(2))

· will output 16

1. What is the output of the following snippet? dct = { 'one':'two', 'three':'one', 'two':'three' } v = dct['three'] for k in range(len(dct)): v = dct[v] print(v)

one

How many stars will the following snippet send to the console? i = 0 while i <= 5 :i += 1 if i % 2 == 0: break print("*")

one

1. The following code prints: print(chr(ord('p') + 2))

One of the following variables' names is illegal - which one?

· in

1. The result of the following division: 1 // 2

· is equal to 0

1. Assuming that tuple is a correctly created tuple, the fact that tuples are immutable means that the following instruction: tuple[1] = tuple[1] + tuple[0]

· is illegal

1. When a file is opened in read mode, it:

· it must exist (an exception will be raised otherwise)

1. How does the readline() method react when the end‑of‑file occurs?

· it returns an empty string

1. What will be the result of executing the following code? def o(p): def q(): return '*' * p return q r = o(1) s = o(2) print(r() + s())

· it will print ***

1. What will be the result of executing the following code? class A: v = 2 class B(A): v = 1 class C(B): pass o = C() print(o.v)

· it will print 1

1. What will be the result of executing the following code? try: raise Exception(1,2,3) except Exception as e: print(len(e.args))

· it will print 3

1. What will be the result of executing the following code? class A: pass class B(A): pass class C(B): pass print(issubclass(C,A))

· it will print True

1. What will be the result of executing the following code? class I: def __init__(self): self.s = 'abc' self.i = 0 def __iter__(self): return self def __next__(self): if self.i == len(self.s): raise StopIteration v = self.s[self.i] self.i += 1 return v for x in I(): print(x,end=")

· it will print abc

1. What will be the result of executing the following code? def I(): s = 'abcdef' for c in s[::2]: yield c for x in I(): print(x,end=")

· it will print ace

1. What will be the result of executing the following code? class A: def __str__(self): return 'a' class B(A): def __str__(self): return 'b' class C(B): pass o = C() print(o)

· it will print b

1. What will be the result of executing the following code? class A: def a(self): print('a') class B: def a(self): print('b') class C(B,A): def c(self): self.a() o = C() o.c()

· it will print b

1. Entering the try: block implies that:

· some of the instructions from this block may not be executed

1. A data structure described as LIFO is actually a:

· stack

The byte array class can create objects which are designed to:

· store amorphic data organized in bytes

1. What is the output of the following snippet? dd = { "1":"0″, "0":"1″ } for x in dd.vals(): print(x,end="")

· the code is erroneous

1. What is the output of the following snippet if the user enters two lines containing 2 and 4 respectively? x=int(input()) y=int(input()) x=x//y y=y//x print(y)

· the code will cause a runtime error

What is the output of the following snippet? def fun(x): if x % 2 == 0: return 1 else: return print(fun(fun(2)) + 1)

· the code will cause a runtime error

1. What is the output of the following piece of code? X = 1 // 5 + 1 / 5 print(X)

0.2

1. How many stars will the following snippet send to the console? i = 4 while i > 0 : i -= 2 print("*") if i == 2: break else: print("*")

1. When a module is imported, its contents:

· are executed once (implicitly)

1. What will be the output of the following snippet? def fun(x): return 1 if x % 2 != 0 else 2 print(fun(fun(1)))

Which of the following lines properly starts a function using two parameters, both with zeroed default values?

· def fun(a=0,b=0):

1. What is the output of the following snippet if the user enters two lines containing 11 and 4 respectively? x=int(input()) y=int(input()) x = x % y x = x % y y = y % x print(y)

1. What is the output of the following snippet? lst = [3, 1, -2] print(lst[lst[-1]])

1. What will be the output of the following line? print(len((1,)))

simbolos

+, -, *, /(Resultado decimal), //(Resultado entero), %, ** ** de derecha a izquierda % de izquierda a derecha

1. How many elements does the L list contain? L = [i for i in range(-1,-2)]

1. The following code x = '\" print(len(x)) prints:

1. The following code prints: x = """ """ print(len(x))

1. What is the output of the following snippet? z = y = x = 1 print(x,y,z,sep='*')

1*1*1

1. The following code: print(ord('c') - ord('a')) prints:

1. What is the output of the following snippet? a = 1 b = 0 c = a & b d = a | b

1. What is the output of the following snippet? def fun(x): if x % 2 == 0: return 1 else: return 2 print(fun(fun(2)))

1. What is the output of the following snippet? tup = (1, 2, 4, 8) tup = tup[1:-1] tup = tup[0] print(tup)

1. What will be the output of the following code? class A: def __init__(self,v = 1): self.v = v def set(self,v): self.v = v return v a = A() print(a.set(a.v + 1))

1. What will be the output of the following code? t = (1,) t = t[0] + t[0] print(t)

1. What is the output of the following snippet? tup = (1, 2, 4, 8) tup = tup[-2:-1] tup = tup[-1] print(tup)

1. A function returning a list of all entities available in a module is called:

· dir()

1. What is the output of the following piece of code if the user enters two lines containing 3 and 6 respectively? y=input() x=input() print(x+y)

1. The following statement: from a.b import c causes the import of:

· entity c from module b from package a

1. If the class's constructor is declared as below, which one of the assignments is invalid? class Class: def __init__(self,val=0): pass

object = Class(1,2)

1. What will be the output of the following snippet? a = True b = False a = a or b b = a and b a = a or b print(a,b)

True False

1. What will be the output of the following code, located in the file module.py? print(__name__)

__main__

1. The folder created by Python used to store pyc files is named:

__pycache__

What will be the output of the following snippet? try: raise Exception except BaseException: print("a") except Exception: print("b") except: print("c")

1. What output will appear after running the following snippet? import math print(dir(math))

a list of all the entities residing in the math module

1. What will be the output of the following snippet? class A: def __init__(self,name): self.name = name a = A("class") print(a)

a string ending with a long hexadecimal number

1. What will be the output of the following piece of code? print("a","b","c",sep="'")

a'b'c

abc

1. What will be the output of the following snippet? try: raise Exception except BaseException: print("a",end=") else: print("b",end=") finally: print("c")

1. Assuming that all three files, a.py, b.py, and c.py reside in the same folder, what will be the output produced by running the c.py file? # file a.py print("a",end=") #file b.py import a print("b",end=") #file c.py print("c",end=") import a import b

cab

None

el literal None. Este literal es llamado un objeto de NonType (ningún tipo)

1. The following statement from a.b import c causes the import of:

entity c from module a from package b

How many hashes will the following snippet send to the console? var = 1 while var < 10: print("#") var = var << 1

four

1. Knowing that a function named f() resides in a module named m, and was imported using the following statement from mod import fun choose the right way to invoke it:

fun()

1. Which of the following lines properly invokes the function defined as:def fun(a,b,c=0)?

fun(a=1,b=0,c=0):

The 0o prefix means that the number after it is denoted as

octal

1. What will be the result of executing the following code? try: raise Exception(1,2,3) except Exception as e: print(len(e.args))

it will print 3

1. What will be the result of executing the following code? class A: pass class B(A): pass class C(B): pass print(issubclass(A,C))

it will print False

1. What will be the result of executing the following code? class A: def __init__(self): pass def f(self): return 1 def g(): return self.f() a = A() print(a.g())

it will raise an exception

1. Which of the following sentences is true? str1 = 'string' str2 = str1[:]

str1 and str2 are different (but equal) strings

1. The meaning of the keyword argument is determined by:

the argument's name specified along with its value

1. The following code prints: x = "\\\" print(len(x))

the code will cause an error

1. The following code prints: x = "\" print(len(x))

the code will cause an error

1. Knowing that the function named m() resides in the module named f, and the code contains the following import statement, choose the right way to invoke the function: from m import f

the import statement is invalid

1. What will be the output of the following snippet? str = 'abcdef' def fun(s): del s[2] return s print(fun(str))

the program will cause an error

1. If you want to fill a byte array with data read in from a stream, you'd use:

the readinto() method

1. What is the output of the following piece of code? x=1 y=2 x, y, z = x, x, y z, y, z = x, y, z print(x,y,z)

· 1 1 2

What is the output of the following snippet? x = 1 / 2 + 3 // 3 + 4 ** 2 print(x)

· 17.5

1. What is the output of the following snippet if the user enters two lines containing 3 and 6 respectively? x=input() y=int(input()) print(x*y)

· 333333

1. What is the output of the following snippet if the user enters two lines containing 2 and 4 respectively? x=int(input()) y=int(input()) print(x+y)

· 6

1. What is the output of the following piece of code if the user enters two lines containing 2 and 4 respectively? x=int(input()) y=int(input()) x=x/y y=y/x print(y)

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