I/O 處理

基本I/O

write

import sys
file = open(sys.argv[1], 'w')
file.write('test')
file.close()

read

import sys
file = open(sys.argv[1], 'r')
content = file.read()
print content
file.close()

import sys
file = open(sys.argv[1], 'r')
while True:
    line = file.readline()
    if not line: break
    print line
file.close()

import sys
file = open(sys.argv[1], 'r')
for line in file.readlines():
    print line
file.close()

處理argument

使用argparse

參數格式：
$ python prog.py 1 2 3 4
4

$ python prog.py 1 2 3 4 --sum
10

import argparse

parser = argparse.ArgumentParser(description='Process some integers.')
parser.add_argument('integers', metavar='N', type=int, nargs='+',
                    help='an integer for the accumulator')
parser.add_argument('--sum', dest='accumulate', action='store_const',
                    const=sum, default=max,
                    help='sum the integers (default: find the max)')

args = parser.parse_args()
print args.accumulate(args.integers)

parser = argparse.ArgumentParser(description='Process an image')
parser.add_argument('image')
parser.add_argument('width', type=int)
parser.add_argument('height', type=int)
args = parser.parse_args()

更複雜的用法參考這篇：Argparse简易教程

參考來源

python document