python little knowledge -sys.argv

sys.argv is a parameter acquired from an external bridge program

1.t1.py

import sys
a = sys.argv
b = len(sys.argv)
print(a)
print(b)

In the python terminal typing python t1.py zhang kang run this script, and into the parameters

The output is:

[ 'T1.py', 'zhang', 'kang']

2.t2.py

import  sys
a = sys.argv[0]
b = sys.argv[1]
c = sys.argv[2]
print("filename:",a)
print("param1:",b)
print("param2:",c)

 

In the python terminal typing python t2.py zhang kang  run this script, and into the parameters

The output is:

filename: t2.py
param1: zhang
param2: kang

 

3.sys.argv [1:] it represents?

This is a slicing
sys.argv parameter passed is a program, you can think of it a list, sys.argv [1:] 1 is to extract the parameters passed back variable.
Such as: test.py 'aaa' 'bbb' 'ccc' 'ddd'

The sys.argv [1:] values ​​represent [ 'bbb', 'ccc', 'ddd']