String In Python

In Python, strings are sequences of characters, represented within either single quotes ' ', double quotes " ", or triple quotes ''' ''' or """ """.

Strings are immutable, meaning once they are created, they cannot be changed.

Here are some common operations and functionalities related to strings in Python:

String Creation:

We can create strings using single quotes, double quotes, or triple quotes for multi-line strings.

Example:

string1 = 'Hello'
string2 = "World"
multilineString = '''This is
a multi-line
string'''

String Concatenation:

We can concatenate strings using the "+" operator.

Example:

full_string = string1 + ' ' + string2

Find String Length:

We can find the length of a string using the "len()" function.

Example:

string1 = "Hello"
string2 = "World"

string1Length = len(string1) // 5

string2Length = len(string2) // 5

multiLineStringLength = len(multilineString) // 27

String Indexing and Slicing:

We can access individual characters or substrings within a string using indexing and slicing.

Example:

string1 = "Hello"
string2 = "World"

char = string1[0]  // Output:  'H'
substring = string2[1:3]  // Output:  'or'

String Methods:

Python provides a variety of built-in methods for working with strings, such as "upper()", "lower()", "strip()", "split()", "join()", "replace()", "find()", and many more.

Example:

str = 'This is a single-line string!!'''


print(str.upper()) // Output: THIS IS A SINGLE-LINE STRING!!

print(str.lower()) // Output: this is a single-line string!!

print(str.strip("!!")) // Output: this is a single-line string

print(str.split()) // Output: ['This', 'is', 'a', 'single-line', 'string!!']

print("-".join(str)) // Output: T-h-i-s- -i-s- -a- -s-i-n-g-l-e---l-i-n-e- -s-t-r-i-n-g-!-!

print(str.replace("single-line", "line")) // Output: This is a line string!!

print(str.find("single-line")) // Output: 10

startswith and endswith String Method:

Python provides methods to check String starting and ending with substring using "startswith()", "endswith()".

Example:

str = 'This is a single-line string!!'''

print(str.startswith("This")) // Output: True

print(str.endswith("!@")) // Output: False

Convert List Into String:

Python provides a method to convert a list into a string using "join()".

Example:

# Using List

your_list = ["apple", "banana", "orange"]

print(",".join(your_list)) // Output: "apple, banana, orange"

String Formatting:

We can format strings using the "%" operator ("printf-style formatting"), "str.format()" method, or "f-strings" (formatted string literals).

Example:

formatted_string = 'Hello, %s!' % 'World'
formatted_string = 'Hello, {}!'.format('World')
formatted_string = f'Hello, {"World"}!'

Raw Strings:

We can create raw strings using the "r" or "R" prefix, which treats backslashes "\" as literal characters.

Example:

raw_string = r'C:\Users\Alice'

String Escape Characters:

We can include special characters in strings using escape sequences, such as "\n" for newline, "\t" for tab, "\\" for a backslash, \" for a double quote, and \' for a single quote.

Example:

escaped_string = 'This is a new line.\nThis is a tab:\tHello'

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