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Python Basics - Strings Cheat Sheet (DRAFT) by

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

String Syntax

s1 = "this is "
Strings can be declared with " "...
 
s2 = 'a string'
... or ' '
 
s1 + s2
Returns s1 concat­enated with s2 ('this is a string')
 
s1 * 3
Returns s1 concat­enated with itself 3 times (this is this is this is)
 
s1[3]
Returns 4th element of s1 (s)
 
s1[0:3]
Returns 1st to 3rd element of s1 (thi)
 
s1[0:7:2]
Returns 1st to 7th element of s1 skipping one at a time (ti s)

String Methods

s = "­stR­ing­"
 
s.capi­tal­ize()
Returns capita­lized version of s (String)
 
s.upper()
Returns upper case version of s (STRING)
 
s.lower()
Returns lower case version of s (string)
 
s.title()
Returns s with first letter of each word capita­lized (String)
 
s.swap­case()
Returns the case swapped version of s (STrING)
 
s.replace('tR', 'l')
Returns a copy of s with all 'tR' replaced by 'l' (sling)
 
s.star­tsw­ith­('R')
Returns true if s starts with 'R' and false otherwise (False)
 
s.ends­wit­h('­ing')
Returns true if s ends with 'ing' and false otherwise (True)
 
s.spli­t('R')
Splits the string into a list of strings. In this case, "­R" is the splitting parameter. (["s­r", "­ing­"])
 
s.strip()
Removes spaces in the begining and in the end of the string ("st­Rin­g")
 
s.stri­p("g­")
Removes "­g" in the begining and in the end of the string ("st­Rin­")
 
''.joi­n([s, 's are cool'])
Returns the string '' concat­enated with s and 's are cool' ('stRings are cool')

String Formatting - Printf Arguments

d
Int
 
f
Float
 
s
String
 
10d
Reserves 10 spaces to the int
 
^10d
Reserves 10 spaces to the int and centralize the content
 
<10d
Reserves 10 spaces to the int and align the content left
 
>10d
Reserves 10 spaces to the int and align the content right
 
*^10d
Reserves 10 spaces to the int , centralize the content and fill the empty spaces with *
 
0>10d
Reserves 10 spaces to the int , align the content right and fill the empty spaces with 0s
 
0>.2f
Format float with 2 decimal places
 
0>10.2f
Reserves 10 spaces to the float and format with 2 decimal places

String - The format() Method

a = 10
b = 3.5555
print("The value of a is {} and the value of b is {:.2f}".format(a, b))
Instead of using a formatted string (only available on Python 3.6 and up) you can also use the format method inserting .format() at the end of the string.

String Formatting - Example

a = 10.12571
print(f"The value of a is {a:.2f}")

# This code prints "The value of a is 10.13"
# Use f before starting a string to make it a formatted string
# Use {a} in a formatted string to interpolate the variable a in the string
# Use :.2f after the variable name to format it as a float with 2 decimal places