Python String Methods
Python String Methods
Python has a set of built-in string methods. The Python string methods are as follows:
| capitalize() | The string.capitalize() method returns a copy of the string by converting the first character to upper case. |
| center() | The string.center() method returns a centered in a string of length width. |
| count() | This method returns the number of times a specified value occurs in a string. |
| decode() | The string.decode() method decodes the string using the codec registered for encoding. |
| encode() | The string.encode() method returns an encoded version of the string |
| endswith() | The string.endswith() method returns a boolean value true if the specified string ends with the given value. |
| expandtabs() | This method returns a copy of the string where all tab characters are expanded using spaces. |
| find() | The string.find () method returns the lowest index in the string where the substring is found else it returns -1. |
| index() | The string.index() method returns the lowest index in the string where the substring is found else it raises a ValueError. |
| isalnum() | This method returns a Boolean value True if all characters in the string are alphanumeric |
| isalpha() | The string.isalpha() method returns True if all characters in thespecified string are in the alphabet. |
| isdigit() | The string.isdigit() method returns True if all characters in the string are in digits. |
| islower() | The string.islower() method returns a Boolean value True if all characters in the specified string are in lower case. |
| isspace() | The string.isspace() method returns true if there are only whitespace characters in the string else it returns false. |
| istitle() | The string.istitle() method returns true if the string is a titlecased string and follows the rules of a tittle. |
| isupper() | The string.isupper() method returns true if all cased characters in the string are uppercase else it returns false. |
| join() | This method joins the elements of an iterable to the end of the string |
| ljust() | The string.ljust() method returns a left justified version of the string. |
| lower() | The string.lower() method returns a copy of the string converted to lowercase. |
| lstrip() | This method returns a copy of the string with leading characters removed. |
| replace() | The string.replace() method returns a string where a specified value is replaced with the old value. |
| rfind() | The string.rfind() method returns the highest index in the string if the substring sub is found else it raises a ValueError. |
| rindex() | This method return the highest index in the string if the substring is found else it returns -1. |
| rjust() | The string.rjust() method returns a right justified version of the specified string of length width. |
| rsplit() | This method returns a list of words in the string by splitting the string at the specified separator. |
| rstrip() | The string.rstrip() method returns a right trim version of the string |
| split() | The string.split() method splits the specified string at separators, and returns the list. |
| splitlines() | This method splits the given string at line breaks and returns the list. |
| startswith() | The string.startswith() returns a Boolean value true if the specified string starts with the given prefix, else it returns False. |
| strip() | The string.strip() method returns a copy of the string by removing the leading and trailing characters. |
| swapcase() | This method returns a copy of the string with uppercase characters converted to lowercase and vice versa. |
| title() | The string.title() method returns the titles cased string by converting the first character of each word to upper case. |
| translate() | The string.translate() method returns a copy of the translated string. |
| upper() | The string.upper() method returns a copy of the string converted to uppercase. |
| zfill() | The string.zfill() method returns the numeric string left filled with a specified number of 0 values at the beginning. |
Example 1
# Python program explaining
# the string methods
# passing the string value
strVal = "hello world";
print("String value:",strVal)
# the capitalize() method
# capitalizing the first character of the String
print ("After capitalizing the string:", strVal.capitalize())
# the center() method
# centering the string with length 40 and fillchar '!'.
print("After the center() method:")
print ( strVal.center(40, '!'))
# the count() method
# returning the count of alphabet 'e'
print ("\nThe count of 'e' in the string is", strVal.count('e'))
# the isalnum() method
# validating if and else condition
if strVal.isalnum() == True:
print("\nAll characters of specified string are alphanumeric.")
else:
print("\nAll the characters are not alphanumeric.")
Output
String value: hello world After capitalizing the string: Hello world After the center() method: !!!!!!!!!!!!!!hello world!!!!!!!!!!!!!!! The count of 'e' in the string is 1 All the characters are not alphanumeric.
Example 2
# Python program explaining
# the string methods
# initializing the string
strVal = "Hello everyone, welcome to my world."
print("The string:",strVal)
# passing the substring
substring="welcome"
# the index() method
# returning the lowest index in the string if the substring
index = strVal.index(substring)
# prinitng the index of the specified substring
print("The index of '",substring,"' is",index)
# the find() method
find= strVal.find('to')
# prinitng the index of the specified substring
print("The index of '",substring,"' is",find)
# the isdigit() method
result = strVal.isdigit()
# printing the isdigit() result
print("The isdigit() method returns: ",result)
# the islower() method
# checking whether the passed string is in a lower case or not
result = strVal.islower()
# printing the islower() result
print("The islower() method returns: ",result)
Output
The string: Hello everyone, welcome to my world. The index of ' welcome ' is 15 The index of ' welcome ' is 23 The isdigit() method returns: False The islower() method returns: False
Example 3
# Python program explaining
# the string methods
# the isspace() method
strVal = " \t"
print("String 1=",strVal)
print("The isspace() method returns: ",strVal.isspace())
# the isupper() method
string = 'TUTORIALSANDEXAMPLES'
print("\nString 2:",string)
print("The above string is upper cased:",string.isupper())
# the join() method
string3 = 'Hello'
string4 = '!!!'
# concatenating each character of string2 to the front of string1
print('\nstring3.join(string4):', string3.join(string4))
# concaneting each character of string1 to the front of string1
print('string4.join(string3):', string4.join(string3))
# the lower() method
# initializing the string
string5 = "HELLO WORLD"
print("\nString5:",string5)
# converting the string to lower case
lowStr = string5.lower()
print("After converting it in lower case:",lowStr)
# the title() method
string6 = "My Favourite Teacher"
print("\nString 6:",string6)
# will return true
print("The above string is Titlecased:",string6.istitle())
Output
String 1= The isspace() method returns: True String 2: TUTORIALSANDEXAMPLES The above string is upper cased: True string3.join(string4): !Hello!Hello! string4.join(string3): H!!!e!!!l!!!l!!!o String5: HELLO WORLD After converting it in lower case: hello world String 6: My Favourite Teacher The above string is Titlecased: True