Python: Quote String

What is String

A string is a sequence of characters.

• In Python 3, it's a sequence of Unicode characters.
• In Python 2, it's a sequence of Bytes (representing ASCII Characters). But if prefixed with u, then it's a sequence of Unicode characters.

String is Immutable

Any function that work on string returns a new string.

String Syntax

there are multiple syntax for string.

example

• "single quoted string with QUOTATION MARK delimiter"
• 'single quoted string with APOSTROPHE delimiter'

• """triple quoted string with QUOTATION MARK delimiter"""
• '''triple quoted string with APOSTROPHE delimiter'''

Single Quoted String (For Single Line, Short String)

example

• "QUOTATION MARK delimited"
• 'APOSTROPHE delimited'

String with different delimiters basically have the same meaning. Only difference is that QUOTATION MARK quoted cannot contain unescaped QUOTATION MARK, and APOSTROPHE quoted cannot contain unescaped APOSTROPHE. (escape means backslash character sequence. 〔see Python: String Escape Sequence〕)

in single quoted string:

• Literal newline character is not allowed. It's syntax error.
• Has special interpretation of backslash character (see String Escape Sequence), unless it's prefixed with r, known as Raw String (r-prefix)

xx = "this is string"

yy = 'another string'

print(xx, yy)

# Literal linebreak is not allowed

xx = "abc
xyz"

#     xx = "abc
#             ^
# SyntaxError: EOL while scanning string literal
# error: cannot format -: Cannot parse: 1:3: a = "abc

Triple Quote String

• Python: Triple Quote String

No Here-String

Python does not suport Here-String (aka here-doc)