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Python String Operations  

(updated at May 10, 2024)   109  
You can return a range of characters by using the slice syntax.Specify the start index and the end index,separated by a colon,to return a part of the string.Slice From the Start.By leaving out...





Python String Operations

JK1436 
Created at Jun 14, 2023 08:46:30
Updated at May 10, 2024 09:36:02 
110   0   0   0  

You can return a range of characters by using the slice syntax.

Specify the start index and the end index, separated by a colon, to return a part of the string.

b = "Hello, World!"
print(b[2:5])

Slice From the Start

By leaving out the start index, the range will start at the first character:

b = "Hello, World!"
print(b[:5])

Slice To the End

By leaving out the end index, the range will go to the end:

b = "Hello, World!"
print(b[2:])

Negative Indexing

Use negative indexes to start the slice from the end of the string:

b = "Hello, World!"
print(b[-5:-2])

Upper Case

a = "Hello, World!"
print(a.upper())

Lower Case

a = "Hello, World!"
print(a.lower())

Remove Whitespace

Whitespace is the space before and/or after the actual text, and very often you want to remove this space.

a = " Hello, World! "
print(a.strip()) # returns "Hello, World!"

Replace String

a = "Hello, World!"
print(a.replace("H", "J"))

Split String

The split() method returns a list where the text between the specified separator becomes the list items.

a = "Hello, World!"
print(a.split(",")) # returns ['Hello', ' World!']

String Concatenation

To concatenate, or combine, two strings you can use the + operator.

a = "Hello"
b = "World"
c = a + b
print(c)
a = "Hello"
b = "World"
c = a + " " + b
print(c)

String Format

As we learned in the Python Variables chapter, we cannot combine strings and numbers like this:

age = 36
txt = "My name is John, I am " + age
print(txt)

But we can combine strings and numbers by using the format() method!

The format() method takes the passed arguments, formats them, and places them in the string where the placeholders {} are:

age = 36
txt = "My name is John, and I am {}"
print(txt.format(age))

The format() method takes unlimited number of arguments, and are placed into the respective placeholders:

quantity = 3
itemno = 567
price = 49.95
myorder = "I want {} pieces of item {} for {} dollars."
print(myorder.format(quantity, itemno, price))

You can use index numbers {0} to be sure the arguments are placed in the correct placeholders:

quantity = 3
itemno = 567
price = 49.95
myorder = "I want to pay {2} dollars for {0} pieces of item {1}."
print(myorder.format(quantity, itemno, price))

Escape Character

To insert characters that are illegal in a string, use an escape character.

An escape character is a backslash \ followed by the character you want to insert.

An example of an illegal character is a double quote inside a string that is surrounded by double quotes:

txt = "We are the so-called "Vikings" from the north."

Escape Characters

Other escape characters used in Python:

CodeResult
\'Single Quote
\\Backslash
\nNew Line
\rCarriage Return
\tTab
\bBackspace
\fForm Feed
\oooOctal value
\xhhHex value

String Methods

Python has a set of built-in methods that you can use on strings.

MethodDescription
capitalize()Converts the first character to upper case
casefold()Converts string into lower case
center()Returns a centered string
count()Returns the number of times a specified value occurs in a string
encode()Returns an encoded version of the string
endswith()Returns true if the string ends with the specified value
expandtabs()Sets the tab size of the string
find()Searches the string for a specified value and returns the position of where it was found
format()Formats specified values in a string
format_map()Formats specified values in a string
index()Searches the string for a specified value and returns the position of where it was found
isalnum()Returns True if all characters in the string are alphanumeric
isalpha()Returns True if all characters in the string are in the alphabet
isascii()Returns True if all characters in the string are ascii characters
isdecimal()Returns True if all characters in the string are decimals
isdigit()Returns True if all characters in the string are digits
isidentifier()Returns True if the string is an identifier
islower()Returns True if all characters in the string are lower case
isnumeric()Returns True if all characters in the string are numeric
isprintable()Returns True if all characters in the string are printable
isspace()Returns True if all characters in the string are whitespaces
istitle()Returns True if the string follows the rules of a title
isupper()Returns True if all characters in the string are upper case
join()Joins the elements of an iterable to the end of the string
ljust()Returns a left justified version of the string
lower()Converts a string into lower case
lstrip()Returns a left trim version of the string
maketrans()Returns a translation table to be used in translations
partition()Returns a tuple where the string is parted into three parts
replace()Returns a string where a specified value is replaced with a specified value
rfind()Searches the string for a specified value and returns the last position of where it was found
rindex()Searches the string for a specified value and returns the last position of where it was found
rjust()Returns a right justified version of the string
rpartition()Returns a tuple where the string is parted into three parts
rsplit()Splits the string at the specified separator, and returns a list
rstrip()Returns a right trim version of the string
split()Splits the string at the specified separator, and returns a list
splitlines()Splits the string at line breaks and returns a list
startswith()Returns true if the string starts with the specified value
strip()Returns a trimmed version of the string
swapcase()Swaps cases, lower case becomes upper case and vice versa
title()Converts the first character of each word to upper case
translate()Returns a translated string
upper()Converts a string into upper case
zfill()Fills the string with a specified number of 0 values at the beginning

 



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