How to use join in python

Usage of the join() function in Python. The join() function is mainly used to splice strings. Function: string.join().

There are two functions in Python: join() and os.path.join(). The specific functions are as follows:
join(): connect string arrays. Concatenate elements in strings, tuples, and lists with specified characters (delimiters) to generate a new string.
os.path.join(): Returns after combining multiple paths.

1. Function description
1. join() function

Syntax: 'sep'.join(seq)

Parameter description
sep: separator. Can be empty.
seq: Element sequence, string, tuple, dictionary to be connected.
The above syntax is: use sep as the separator to combine all elements of seq into a new string.

Return value: Returns a string generated by connecting each element with the delimiter sep.

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2. os.path.join() function

Syntax: os.path.join(path1[,path2[,...]])

Return value: Return after combining multiple paths.

Note: Parameters before the first absolute path will be ignored.

2. Example

Operate the sequence (use ' ' and ':' as separators respectively)

>>> seq1 = ['hello','good','boy','doiido']
>>> print ' '.join(seq1)
hello good boy doiido
>>> print ':'.join(seq1)
hello:good:boy:doiido

Operation on string

>>> seq2 = "hello good boy doiido"
>>> print ':'.join(seq2)
h:e:l:l:o: :g:o:o:d: :b:o:y: :d:o:i:i:d:o

Operation on tuple
##

>>> seq3 = ('hello','good','boy','doiido')
>>> print ':'.join(seq3)
hello:good:boy:doiido

Operation on dictionary

>>> seq4 = {'hello':1,'good':2,'boy':3,'doiido':4}
>>> print ':'.join(seq4)
boy:good:doiido:hello

Merge Directory

>>> import os
>>> os.path.join('/hello/','good/boy/','doiido')
'/hello/good/boy/doiido'

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