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Python Basics1 Cheat Sheet (DRAFT) by

This is a draft cheat sheet. It is a work in progress and is not finished yet.

Hello World in Python

print(­"­Hello World!­")

Python Comments

Example 1 
 #This is a comment
Example 2 
 #This is a comment 
 #written in 
 #more than just one line
Example 3 
 "­"­"   This is a comment 
 written in 
 more than just one line "­"­"

Python Variables

  x = "How old are you ?" #x is of type str  
print(x) 
 >>> How old are you ?

 x = 25 #x now is of type int 
 print(x) 
 >>> 25

Python Data Types

Text Type:
 
str
Numeric Types:
 
int, float, complex
Sequence Types:
 
list, tuple, range
Mapping Type:
 
dict
Set Types:
 
set, frozenset
Boolean Type:
 
bool
Binary Types:
 
bytes, bytearray, memoryview
Get the data type of a variable "­var­"
 
type(var)
 

Python Data Types Examples

Example
Data Type
 
x = "­­Co­lor­"
 
list
 
x = 1
 
int
 
x = 1.2
 
float
 
x = 2j
 
complex
 
x = ["Bl­­ue­"­,­"­­Red­­"­,­"­Ye­­llo­­w"]
 
list
 
x = ("Bl­ue",­"­Red­"­,"Ye­llo­w")
 
tuple
 
x = range(8)
 
range
 
x={"­Age­"­:25­,"He­igh­t":1.72}
 
dict
 
x = {"Pi­nk",­"­Red­"}
 
set
 
x = frozen­set­({"P­ink­"­,"Re­d"})
 
frozenset
 
x = True
 
bool
 
x = b"Co­lor­"
 
bytes
 
 x = bytear­ray(8) 
bytearray
 
 x = memory­vie­w(b­yte­s(8)) 
memoryview
Get the data type of x :
 
memoryview
 
 x = "­Col­or" 
 print(­typ­e(x)) 
 >>> str

Python Casting

Casting is used to specify a type on to a variable and this is done using constr­uctor functions.
Examples 
x = int(5)
          #x = 5 
x = int(2.8)
     ­ #x = 2 
x = float(5)
     ­ #x = 5.0 
x = float(2.8)
  #x = 2.8