Introduction to Python String Methods | Python Exercise | PY - 07 смотреть онлайн

Python String Methods:
In Python, a string is a sequence of characters enclosed within single quotes (' '), double quotes (" "), or triple quotes (''' ''' or """ """). Strings are used to represent text data in Python, and they can contain letters, numbers, symbols, and spaces. Strings are immutable, meaning once created, their contents cannot be changed. However, you can create new strings based on existing ones through various string methods.

String methods are built-in functions in Python that allow you to perform various operations on strings. These methods enable you to manipulate and process strings effectively. Some of the commonly used string methods include:

len(): Returns the length of the string (number of characters).

strip(): Removes leading and trailing whitespaces from the string.

lower(): Converts the string to lowercase.

upper(): Converts the string to uppercase.

capitalize(): Capitalizes the first character of the string.

replace(old, new): Replaces all occurrences of the 'old' substring with the 'new' substring.

split(): Splits the string into a list of substrings based on a delimiter (default is whitespace).

join(iterable): Concatenates elements of the 'iterable' (e.g., list, tuple) with the string as a separator.

startswith(prefix): Returns True if the string starts with the specified 'prefix'.

endswith(suffix): Returns True if the string ends with the specified 'suffix'.

find(substring): Returns the index of the first occurrence of 'substring' in the string, or -1 if not found.

count(substring): Returns the number of occurrences of 'substring' in the string.

isdigit(): Returns True if all characters in the string are digits.

isalpha(): Returns True if all characters in the string are alphabetic.

isalnum(): Returns True if all characters in the string are alphanumeric (letters and digits).

These are just a few examples of the many string methods available in Python. They provide a powerful set of tools for working with text data in various applications. To use a method, you typically write the method name after the string variable, separated by a dot, and then any necessary arguments in parentheses. For example:


my_string = "Hello, World!"
print(my_string.lower()) # Output: "hello, world!"
print(my_string.replace("Hello", "Hi")) # Output: "Hi, World!"
print(my_string.split(",")) # Output: ['Hello', ' World!']