n ways to concatenate Python strings

There are many string connections in Python, and today you write the code, and by the way, summarize:

• The most primitive way to connect strings: Str1 + str2
• Python new string connection syntax: STR1, STR2
• Strange string Way: str1 str2
• % connection string: ' name:%s; Sex: '% (' tom ', ' Male ')
• String List connection: Str.join (some_list)

First, presumably as long as the programmer has the experience of the people, it is estimated that the direct use of "+" to connect two strings:

' Jim ' + ' Green ' = ' jimgreen '

The second is special, if two strings are separated by "comma", then the two strings will be concatenated, but there will be a space between the strings:

1. ' Jim ', ' green ' = ' Jim Green '

The third is also Python-specific , as long as the two strings together, the middle of a blank or no blank: two strings are automatically connected to a string:

1. ' Jim ' Green ' = ' jimgreen '
2. ' Jim ' Green ' = ' jimgreen '

The fourth function is more powerful, drawing on the function of the printf function in C, if you have a C language basis, look at the document to know . In this way, a string and a set of variables are concatenated with the symbol "%", and the special tags in the string are automatically replaced with the variables in the right variable group:

1. '%s ',%s '% (' Jim ', ' green ') = ' jim, green '

The fifth type is the technique, using the string function join . This function takes a list and then connects each element of the list with a string:

1. Var_list = [' Tom ', ' David ', ' John ']
2. A = ' # # # '
3. A.join (var_list) = ' tom## #david # # #john '

In fact, Python also has a way of string connection, but not much, is the string multiplication, such as:

1. A = ' abc '
2. A * 3 = ' abcabcabc '