Python String Functions With Examples
Python string is the sequence of Unicode characters represented in quotation marks. Single and double to triple quotes can be used to define a string function. With Python programming language providing in-built functions and operators for performing operations in the string, handling it becomes a simpler and easier task. The Python string is now immutable, meaning all in-built Python functions return a new string without modifying the original string. Today, we will talk about various Python string functions, also known as string methods.
Python String Functions With Examples
Python is one of the most famous programming languages in the world right now. It has a wide scope as it is a growing field. Understanding the various Python string functions is a must if you want to excel as a Python programmer. You can build your Python skills by attending seminars, reading related blogs, or taking a Python course to sharpen your programming skills.
Basic String Functions
lower()
The lower() string function returns a given string into a new string where all characters are in lowercase. This specific function simply ignores symbols and numbers and, thus, has nothing to do with them.
Syntax: “string.lower()” is the syntax of the lower string function.
For example,
string = “Internshala is Working to Equip Students with Relevant Skills and Practical Exposure”
print(string.lower())
Output:
internshala is working to equip students with relevant skills and practical exposureUpper()
The upper() string function returns a given string into a new string where all characters are in the uppercase. This specific function simply ignores symbols and numbers and, thus, has nothing to do with them. “string.upper()” is the syntax of the upper string function.
For example,
string = “Internshala is Working to Equip Students with Relevant Skills and Practical Exposure”
print(string.upper())
Output:
INTERNSHALA IS WORKING TO EQUIP STUDENTS WITH RELEVANT SKILLS AND PRACTICAL EXPOSUREcapitalize()
The capitalize() string function returns a given string into a new string where only the first character is in the uppercase and all the remaining characters are in the lowercase.
Syntax: “string.capitalize()” is the syntax of capitalize string function.
For example,
string = “i am learning the PYTHON Programming Language”
print(string.capitalize())
Output:
I am learning python programming language.title()
The title() string function returns a given string into a new string where the first character of each word is in the uppercase, and the remaining characters are in the lowercase.
Syntax: “string.title()” is the syntax of the title string function.
For example,
string = “i am learning PYTHON Programming Language”
print(string.title())
Output:
I Am Learning Python Programming Languagecasefold()
Similar to the lower() string function, the casefold() function returns a given string into a new string where all characters are in lowercase. However, the casefold() function is stronger and is used to perform a case-insensitive comparison.
Syntax: “string.casefold()” is the syntax of the casefold string function.
For example,
string = ““I Am learning PYTHON PROGRAMMING LANGUAGE”
print(string.casefold())
Output:
i am learning python programming languageswapcase()
The swapcase() string function returns an uppercase lettered string into a new string with all letters in the lowercase and vice-versa.
Syntax: “string.swapcase()” is the syntax of the swapcase string function.
For example,
Example 1:
string = “I AM LEARNING PYTHON PROGRAMMING LANGUAGE”
print(string.swapcase())
Output:
i am learning python programming languageExample 2:
string - “i am learning python programming language”
print(string.swapcase())
Output:
I AM LEARNING PYTHON PROGRAMMING LANGUAGEformat()
The Python string format function is used to format the string for console printing.
Syntax: “string.format()” is the syntax of the format string function.
For Example,
string = “I have {an : .2f} Candies!”
print (string.format() (an = 4)
Output:
I have 4 Candies!Also Read: Python Projects With Source Code
Find and Replace String Functions
encode()
The encode() function is used to encode the string using a specified encoding scheme.
Syntax: “string.encode()” is the syntax of encode string function.
For example,
#Variable Declaration
string = “HELLO”
encode = str.encode()
#Displaying Result
print(“Old value”,str)
print(“Encoded value”,encode)
Output:
old vale HELLO
Encoded value b ‘HELLO’find()
The find() function is used to find the index of a given substring in a string.
Syntax: “string.find()” is the syntax of the find string function.
For Example,
string = “Python is a fun programming language”
#check the index of ‘fun’
print(string.find(‘fun’))
Output:
12replace()
The replace() function is used to return a string where a specified value is replaced with another specified value.
Syntax: “string.replace()” is the syntax of replace string function.
For example,
string = “bat ball”
#replacing ‘ba’ with ‘ro’
replaced_string - string.replace(‘ba’ , ‘ro’)
print(replaced_string)
Output:
rot rollLet’s check out some more find and replace string functions in python with examples:
| Function | Description | Syntax |
| rfind() | The rfind() function is used to search a given string for a specified value and return the last position of where it was found. | string.rfind() |
| index() | The index() function returns the first position of the first occurrence of a substring in a string. | string.index() |
| rindex() | The rindex() function returns the highest index of the substring inside a string. | string.rindex() |
Checks String Functions
The following table specifies checks string functions:
| Function | Description | Syntax |
| startswith() | The startswith() function returns “True” when the string starts with the given substring, otherwise it returns ‘False.’ | string.startswith() |
| endswith() | The endswith() function returns “True” when the string ends with the given substring, otherwise it returns ‘False.’ | string.endswith() |
| isdigit() | The isdigit() function returns ‘True’ when all characters in a given string are digits, otherwise it returns ‘False.’ | string.isdigit() |
| isalnum() | The isalnum() function returns ‘True’ when all characters in a given string are alphanumeric, otherwise it returns ‘False.’ | string.isalnum() |
| isalpha() | The isalpha() function returns ‘True’ when all characters in a given string are alphabets, otherwise it returns ‘False.’ | string.isalpha() |
| isidentifier() | The isidentifier() function returns ‘True’ when a given string is valid, otherwise it returns ‘False.’ | string.isidentifier() |
| isdecimal() | The isdecimal() function returns ‘True’ when all characters in a given string are decimals, otherwise it returns ‘False.’ | string.isdecimal() |
| isnumeric() | The isnumeric() function returns ‘True’ when all characters in a given string are numeric, otherwise it returns ‘False.’ | string.isnumeric() |
| islower() | The islower() function returns ‘True’ when all cased characters in a given string are lowercase and there is at least one cased character, otherwise it returns ‘False.’ | string.islower() |
| isprintable() | The isprintable() function returns ‘True’ when all characters in a given string are printable, otherwise it returns ‘False.’ | string.isprintable() |
| isupper() | The isupper() function returns ‘True’ when all cased characters in a given string are uppercase, otherwise it returns ‘False.’ | string.isupper() |
| isspace() | The isspace() function returns ‘True’ when there are all whitespace characters in a given string, otherwise it returns ‘False.’ | string.isspace() |
| istitle() | The istitle() function returns ‘True’ when a given string is title cased and not empty, otherwise it returns ‘False.’ | string.istitle() |
Also Read: Lambda Functions in Python
Padding and Cleaning String Functions
Following table specifies the various padding and cleaning string functions:
| Function | Description | Syntax |
| center() | The center() function is used to pad a given string with the specified character. | string.center() |
| strip() | The strip() function is used to remove both leading and trailing characters from a given string. | string.strip() |
| rstrip() | The rstrip() function is used to remove the trailing characters from a given string. | string.rstrip() |
| lstrip() | The lstrip() function is used to remove the leading characters from a given string. | string.lstrip() |
| ljust() | The ljust() function is used to align a given string to the left using a specified width. | string.ljust() |
| rjust() | The rjust() function is used to align a given string to the right using a specified width. | string.rjust() |
| zfill() | The zfill() function is used to return a string’s copy with ‘0’ characters padded to the left side of the string. | string.zfill() |
Python Split and Join String Functions
The following table specifies the various split and join string functions:
| Function | Description | Syntax |
| join () | The join() function is used to return a concatenated string. | string.join() |
| partition() | The partition() function is used to split the string on the first occurrence of the separator. | string.partition() |
| rpartition() | The rpartition() function is used to split the string into three parts. | string.rpartition() |
| split() | The split() function is used to split a string using a specified separator. | string.split() |
| rsplit() | The rsplit() function is used to split a string from the right using a specified separator. | string.rsplit() |
| splitlines() | The splitlines() function is used to split the lines at line boundaries. | string.splitlines() |
Miscellaneous String Functions
The following table specifies miscellaneous string functions:
| Function | Description | Syntax |
| format_map() | The format_map() function is used to format specified values in a given string using a dictionary. | string.format_map() |
| count() | The count() function is used to count the number of occurrences of a substring in a given string. | string.count() |
| translate() | The translate() function is used to change the given string using translation mappings. | string.translate() |
Key Takeaway
Let’s summarize everything we have learned about Python string functions with examples so far.
- Python string is defined as the sequence of Unicode characters enclosed in quotation marks.
- Several built-in functions are provided by Python to manipulate strings.
- The string functions are further categorized into case change, find and replace, checks, padding, and cleaning, split and join, and miscellaneous string functions.
FAQs
There are several String functions in Python that are used for different purposes like creating a formatted string, returning a new string, replacing string function, and translating string function.
According to Python 3.11, these are the functions in use:
stringliteral
stringprefix
shortstring
longstring
shortstringitem
longstringitem
shortstringchar
longstringchar
stringescapeseq
Yes, there is a replace function in Python that is used to replace a specific phrase with another phrase.
The string strip() method is used to clean up the strings in Python.
Python has plenty of built-in string methods for modifying and analyzing strings. Python has 51 string functions, including methods to locate, replace, divide, join, format, and compare strings, among others. These functions make it easy to work with and handle strings in Python programming.
