[Python tutorial] 26. Keyword

and

A logical operator

x = (5 > 3 and 5 < 10)

as

To create an alias

import calendar as c

assert

For debugging

x = "hello"

#if condition returns True, then nothing happens:
assert x == "hello"

#if condition returns 
False, AssertionError is raised:
assert x == "goodbye"

break

To break out of a loop

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

class

To define a class

class Person:
  name = "John"
  age = 36

continue

To continue to the
next iteration of a loop

for i in range(9):
  if i == 3:
    continue

def

To define a function

def my_function():
  print("Hello from a function")

del

To delete an object

class MyClass:
  name = "John"

del MyClass

elif

Used in conditional statements, same as else if

for i in range(-5, 5):
  if i > 0:

print("YES")
  elif i == 0:
    print("WHATEVER")

else:
    print("NO")

else

Used in conditional statements

x = 2
if x > 3:
  print("YES")
else:
  print("NO")

except

Used with exceptions, what to do when an exception occurs

try:
  x > 3
except:
  print("Something went wrong")

False

Boolean value, result of comparison operations

print(5 > 6)

finally

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

try:
  x > 3
except:
  print("Something went wrong")

else:
  print("Nothing went wrong")
finally:
  print("The try...except block is finished")

for

To create a for loop

for x in range(1, 9):

from

To import specific parts of a module

from datetime import time
x = time(hour=15)

global

To declare a global variable

#create a function:
def myfunction():
  global x
  x = "hello"

#execute the function:
myfunction()

#x should now 
be global, and accessible in the global scope.
print(x)

if

To make a conditional statement

x = 5
if x > 3:
 print("YES")

import

To import a module

import datetime

in

To check if a value is present in a list, tuple, etc.

fruits = ["apple", "banana", "cherry"]
if "banana" in fruits:
  print("yes")

is

To test if two variables are equal

x = ["apple", "banana", "cherry"]
y = x
print(x is y)

lambda

To create an anonymous function

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

None

Represents a null value

x = None

nonlocal

To declare a non-local variable

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

not

A logical operator

x = False
print(not x)

or

A logical operator

x = (5 > 3 or 5 > 10)

pass

A null statement, a statement that will do nothing

for x in [0, 1, 2]:
  pass

raise

To raise an exception

x = -1

if x < 0:
  raise Exception("Sorry, no numbers below zero")

return

To exit a function and return a value

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

True

Boolean value, result of comparison operations

print(7 > 6)

try

To make a try...except statement

try:
  x > 3
except:
  print("Something went wrong")

while

To create a while loop

x = 0
while x < 9:
  print(x)
  x = x + 1

with

Used to simplify exception handling

yield

To end a function, returns a generator