Python Conditions Cheat Sheet

A Programming › Python cheat sheet in English by Nouha_Thabet

24,400 views 3,317 downloads 19 Dec 2019 History

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Example

`a = 2 b = 8 if (a < b): print("a < b") >>> a < b`
We must define scope before the `print`. In fact python relies on indentation (whitespace at the beginning of a line) to define scope in the code.

Elif

`if (a > b): print("a > b") elif (a < b): print("a < b") >>> a < b`
The `elif` keyword is used to say if the previous conditions were not true, then try this condition.

Else

`if (a > b): print("a > b") elif (a < b): print("a < b") else: print("a is equal to b")`
The else keyword catches anything which isn't caught by the preceding conditions.

Short Hand If

if a < b: print("a < b")

Short Hand If ... Else

Two conditions:
`print("a > b") if a > b else print("a < b")`
Three conditions:
`print("a > b") if a > b else print("a is equal to b") if a == b else print("a < b") >>> a < b`

AND

if (condition_1 and condition_2):
      print("Both conditions are correct") 
 else: 
     print("At least one of the conditions is incorrect")

OR

if (condition_1 or condition_2):
      print("At least one of the conditions is correct") 
 else: 
     print("Both conditions are incorrect")

Nested If

if (a > 0): 
      if (a > b): 
          print("a > 0 and a > b") 
      elif (a < b): 
          print("a > 0 and a < b") 
else: 
      print("a < 0") 
 >>> a > 0 and a < b

The pass Statement

`if (a < b): pass`
`if` statements cannot be empty, but if we for some reason have an if statement with no content, we can put in the `pass` statement to avoid getting an error.

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Comments (1)

Md. Zubair 17:19 21 Dec 2019

Great one. Carry on!