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Python Basics & Strings Cheat Sheet by

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 :
 
 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

Python Strings

Operations on strings and examples:
Multiline strings
 
x = "­"­" This is a

multiline string­"­"­"
Get the character at a specific position
 
x = "­Python Progra­mmi­ng" 
 print(­x[1])    ­#print character at position 1 
 >>> y
Slicing
 
x = "­Python Progra­mmi­ng" 
 print(­x[3:5]) 
 >>> ho
Negative Indexing
 
x = "­Python Progra­mmi­ng" 
 print(­x[-­15:­-13]) 
 >>> ho
String Length
 
x = "­Hel­lo" 
 print(­len(x)) 
 >>> 5
Remove any whitespace from the beginning or the end
 
x = "­    Hello     " 
 print(­x.s­trip())     #return "­Hel­lo"
Return the string in lower case
 
x = Hello 
 print(­x.l­ower())     #return "­hel­lo"

Python Strings

Return the string in upper case
 
x = Hello 
 print(­x.u­pper())     #return "­HEL­LO"
Replace a string with another string
 
x = "­Hel­lo" 
  print(­x.r­epl­ace­("He­"­,"A"))  ­  #return "­All­o"
Choose a separator and split string into substrings
 
x = "­Python Progra­mmi­ng" 
 print(­x.s­pli­t(" ")) # return ['Python' , 'Progr­amm­ing']
Check if a string is present in a text
 
txt = "­Tunisia is a North African countr­y" 
 x = "­Nor­th" in txt 
 print(x) # return True
Concat­enation
 
x = "­Hel­lo" 
 y = "­Wor­ld" 
 z = x + " " + y 
 print(z) # return "­Hello World"
Insert numbers into strings
 
quantity = 3 
 itemno = 567 
price = 49.95 
myorder = "I want {} pieces of item {} for {} dollar­s." 
print(myorder.format(quantity, itemno, price))
 

Metadata

  • Languages:
  • Published: 4th December, 2019
  • Last Updated: 6th December, 2019
  • Rated: 5 out of 5 stars based on 2 ratings

Favourited By

jeaninem71

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