Pythonstruct. unpack

In Python, the sub-string in a string is extracted in a certain format. it is very efficient to use struck. unpack. 1. set the fomat format as follows:

The code is as follows:

# Take the first five characters, skip the four Chinese characters, and then take three more characters
Format = '5s 4x 3s'

2. use struck. unpack to obtain the substring

The code is as follows:

Import struct
Print struct. unpack (format, 'Test astring ')
# ('Test', 'in ')

Let's take a simple example. there is a string 'he is not very happy '. after processing it, remove the not in the middle and then output it.

The code is as follows:

Import struct
TheString = 'he is not very happy'
Format = '2s 1x2 s 5x 4S 1x 5s'
Print ''. join (struct. unpack (format, theString ))

Output result:
He is very happy