Python Strings - String Type Tutorial with Examples - APPFICIAL
A string is a data type, and string variables can hold sequences of text. A string literal is the actual string value used inside your python program. A programmer creates a string literal by surrounding text with single or double quotes. Ex: name = ‘Bob’, or city = other_city, where other_city is a string variable.
The string data type is also called a sequence type because it holds characters in a specific order. For example, the word ‘Hello’ is a string, where the H is at index position 0, the e is at index 1, the l’s are at 2 and 3, and the o is a index 4. You can access any of these characters by placing the index in brackets. Ex:
word = ‘Hello’
print(word[0], word[4])
You can use the input() function to get strings from user input, while your program is running. Ex:
print(‘What is your name?’)
name = input()
print(‘Hello’, name)
The length of a string refers to the number of characters. For example, ‘Bob’ has a length of 3. To get the length of a string in your program, use the len() function.
Strings are immutable, which means that you cannot change the characters of a string’s value. Functions that appear to alter a string, actually just returns back an all new string, since they cannot change the original string. You can assign a string variable to a new string or to a function call that returns a new string.
name = ‘James’
print(name.upper())
print(name) # not uppercase this time
name = name.upper()
print(name) # is uppercase this time
You can glue strings together using the + operator. This is called string concatenation. Ex: name = ‘Tony’ + ‘ Montana’.
Note that the result of string concatenation is a new string, so the original string is not changed.
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