8 methods of Python string concatenation summary detailed information overview
There are many ways to concatenate strings in Python. Here is a brief summary. It should be more comprehensive and convenient for future reference.
Plus connection
The first one, through the + sign:
>>> a, b ='hello', 'world'>>> a + b'hello world'
Comma connection
The second, through, comma form:
>>> a, b ='hello', 'world'>>> print(a, b)hello world
However, one thing to note when using the comma form is that it can only be used for print printing, and assignment operations will generate tuples:
>>> a, b('hello', 'world')
direct connection
The third type, whether there are spaces in the middle of the direct connection can be:
print('hello' 'world')print('hello''world')
%
The fourth is to use the% operator.
Before Python 2.6, the% operator was the only way to format strings, and it can also be used to concatenate strings.
print('%s %s'% ('hello','world'))
format
Fifth, use the format method.
The format method is a string formatting method that replaces the% operator in Python 2.6, and can also be used to concatenate strings.
print('{}{}'.format('hello', 'world')
join
Sixth, use the join built-in method.
String has a built-in method join whose parameter is a sequence type, such as an array or tuple.
print('-'.join(['aa','bb','cc']))
f-string
Seventh, use the f-string method.
In Python 3.6, Formatted String Literals (literal formatted strings), abbreviated as f-string, is introduced in Python 3.6. f-string is an evolutionary version of the% operator and the format method, using f-string to connect strings and using the% operator The format method is similar.
>>> aa, bb ='hello','world'>>> f'{aa} {bb}''hello world'
*
Eighth, use the * operator.
>>> aa ='hello'>>> aa * 3'hello hello hello '
summary
When concatenating a small number of strings
The + operator is recommended.
If you have high performance requirements and the python version is 3.6 or higher, f-string is recommended. For example, f-string is much more readable than the + sign in the following situations:
a = f'Name: {name} Age: {age} Gender: {gender}'b ='Name:' + name +'Age:' + age +'Gender:' + gender
When concatenating a large number of strings
It is recommended to use join and f-string methods. The choice still depends on the Python version you are using and your readability requirements.
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