Python Keywords

Question 1

and

Answer 1

a logical operator

x = 5

print(x > 3 and x < 10) # both must be True

Question 2

as

Answer 2

To create an alias

import numpy as np

Question 3

assert

Answer 3

The assert keyword lets you test if a condition in your code returns True, if not, the program will raise an AssertionError.

Write a message if the condition is False:

x = “hello”

#if condition returns False, AssertionError is raised:
assert x == "goodbye", "x should be 'hello'"

Question 4

break

Answer 4

End the loop if i is larger than 3:

for i in range(9):
if i > 3:
break
print(i)

Question 5

class

Answer 5

To define a class

**class** Person:
 def \_\_init\_\_(self, name, age):
 self.name = name
 self.age = age

p1 = Person(“John”, 36)
p1 # (John, 36)

Question 6

continue

Answer 6

To continue to the next iteration

for i in range(9):
if i == 3: # 3 is skipped
continue
print(i) # (0,1,2,4,5,6,7,8)

Question 7

def

Answer 7

To define function

def my_function():
print(“Hello from a function”)

my_function()

Question 8

del

Answer 8

To delete an object

thislist = [“apple”, “banana”, “cherry”]
del thislist[0] # removes apple
print(thislist)

thislist = [“apple”, “banana”, “cherry”]
del thislist # deletes entire list

Question 9

elif

Answer 9

Used in conditional statements, The elif is short for else if.

a = 33
b = 33

if b > a:
print(“b is greater than a”)
elif a == b:
print(“a and b are equal”)
else:
print(‘this’)

Question 10

else

Answer 10

Used in conditional statements

catches anything which isn’t caught by the preceding conditions.

a = 200
b = 33

if b > a:
print(“b is greater than a”)
elif a == b:
print(“a and b are equal”)
else:
print(“a is greater than b”)

Question 11

except

Answer 11

Used with exceptions, what to do when an exception occurs.

The except block lets you handle the error.

try:
print(x) # not defined
except:
print(“An exception occurred, define your vaiables!”)

Question 12

False

Answer 12

Boolean value, result of comparison operations

a = 200
b = 33

if b > a: # True
print(“b is greater than a”)
else: # False
print(“b is not greater than a”)

Question 13

finally

Answer 13

Used with exceptions, a block of code that will be executed no matter if there’s an exception or not.

The finally block will always be executed, no matter if the try block raises an error or not:

try:
x > 3
except:
print(“Something went wrong”)
else:
print(“Nothing went wrong”)
finally:
print(“The try…except block is finished”)

Question 14

for

Answer 14

To create a for loop

fruits = [“apple”, “banana”, “cherry”]
for x in fruits:
print(x)

Question 15

from

Answer 15

To import specific parts of a module

from collections import OrderedDict

a = [1,2,2,3,4,4,5,5,5]

res = list(OrderedDict.fromkeys(a))
print(res)

Question 16

global

Answer 16

Normally, when you create a variable inside a function, that variable is local, and can only be used inside that function.

To create a global variable inside a function, you can use the global keyword

def myfunc():
**global** x
 x = "fantastic"

myfunc()
print(“Python is “ + x)

Question 17

if

Answer 17

To make a conditional statement

a = 33
b = 200

if b > a: # conditional True or False
print(“b is greater than a”)

Question 18

import

Answer 18

To import a module into a project

import pandas as pd

import numpy as np

Question 19

in

Answer 19

Membership operators are used to test if a sequence is presented in an object:

fruits = [“apple”, “banana”, “cherry”]

for x in fruits:
if x == ‘banana’:
break
print(x)

Question 20

is

Answer 20

Identity operator are used to compare the objects, not if they are equal, but if they are actually the same object, with the same memory location

x = 27

y = ‘27’

x is y # False

Question 21

lambda

Answer 21

lambda arguments : expression

Add 10 to argument a, and return the result:

x = lambda a : a + 10
print(x(5))

Question 22

None

Answer 22

The None keyword is used to define a null value, or no value at all.

x = None

if x:
print(“Do you think None is True?”)
elif x is False:
print (“Do you think None is False?”)
else:
print(“None is not True, or False, None is just None…”)

Question 23

nonlocal

Answer 23

Make a function inside a function, which uses the variable x as a non local variable:

def myfunc1():
 x = "John"
 def myfunc2():
**nonlocal** x
 x = "hello"
 myfunc2()
 return x

print(myfunc1())

Question 24

not

Answer 24

The not keyword is a logical operator.

The return value will be True if the statement(s) are not True, otherwise it will return False.

x = False
print(not x) # True

Question 25

or

Answer 25

Logical operators are used to combine conditional statements.

The return value will be True if one of the statements return True, otherwise it will return False.

x = (5 > 3 or 5 > 10) # either can be True
print(x)

Question 26

pass

Answer 26

A null statement, a statement that will do nothing.
Python functions can’t be empty

def my\_function():
 **pass**

Question 27

raise

Answer 27

The raise keyword is used to raise an exception.

You can define what kind of error to raise, and the text to print to the user.

x <= -1
if x raise Exception(“Sorry, no numbers below zero”)

Question 28

return

Answer 28

To exit a function and return a value.

Exit a function and return the sum:

def myfunction():
**return** 3+3

print(myfunction())

Question 29

True

Answer 29

Boolean value, result of comparison operations.

x is not y

print(x) # True

Question 30

try

Answer 30

When an error occurs, or exception as we call it, Python will normally stop and generate an error message.

These exceptions can be handled using the try statement:

try:
print(x)
except:
print(“An exception occurred”)

Question 31

while

Answer 31

With the while loop we can execute a set of statements as long as a condition is true.

Print i as long as i is less than 6:

i = 1
while i < 6:
print(i)
i += 1

Question 32

with

Answer 32

Used to simplify exception handling

using with statement

with open(‘file_path’, ‘w’) as file:

file.write(‘hello world !’)

Question 33

yield

Answer 33

To end a function, returns a generator

An infinite generator function that prints
# next square number. It starts with 1

def nextSquare():

i = 1;

An Infinite loop to generate squares

while True:
yield i*i
i += 1 # Next execution resumes

from this point

Question 34

is not

Answer 34

Identity operator are used to compare the objects, not if they are equal, but if they are actually the same object, with the same memory location

x = 27
y = '27'

x is not y #True

Question 35

not in

Answer 35

Membership operators are used to test if a sequence is presented in an object:

a = [1,2,2,3,4,4,5,5,5]
res = []

for num in a:

if num not in res:

res.append(num)

print(res)

Question 36

Truthy or Falsie

bool(0)

Answer 36

Falsie

Question 37

Truthy or Falsie

bool(1)

Answer 37

Truthy

Question 38

Truthy or Falsie

bool([])

Answer 38

Falsie

Question 39

Truthy or Falsie

bool(‘’ ‘)

Answer 39

Falsie

Question 40

Given Truthy or Falsie, sum this code

True + 5 + True

Answer 40

7

Question 41

Given Truthy or Falsie, sum this code

True - False - False + True

Answer 41

2

Question 42

Given Truthy or Falsie, sum this code

True * 4

Answer 42

4