python常用腳本模板：數組：正則表達式re.split/re.search/re.sub：調用shell命令：讀寫文本

python常用腳本模板：

1. 數組
2. 正則表達式re.split/re.search/re.sub
3. 調用shell命令
4. 讀寫文本

#!/usr/bin/env python

# readme
# 1. print need () in python 3.x
# 2. recommend re.split, no string.split
# 3. print will add "'n" default. """print(line,end='')""" in python 3.x; """print line,""" in python 2.x .

import os;
import re;
import sys; # for debug

# list var
list=["nihao","123",456,"hello"]
list[1]='word'
for i in list:
    print(i)
# string replace
list[1]=list[1].replace("word","world")
for i in list:
    print(i)
# recommend re.split, no string.split
str="hello world \n welcome"
print(str.split(' '))
print(str.split('\n'))
# re.split
str="hello world \n welcome"
print(re.split(r'\s+',str))
print(re.split(r' |\n',str))
print(re.split(r'\n+',str))
print(re.split(r'\w+',str))


# shell command in common
os.system(r'rm -f out.log')
# shell command should return value
P=os.popen('ls -al','r')
output=P.read()
print(output)
P.close

# for debug
print(sys._getframe().f_lineno)

os.system(r'rm -f out.log')
# re.search()
# re.sub()
# like perl process file with regexp
# read file from setup.py
# write file to out.log
F=open("setup.py","r")
F1=open("out.log","w")
for line in F:
    matchObj=re.search(r'(.*)run(.*)',line)
    if matchObj:
        print("!!!!!!!!!!!!!Match!!!!!!!!!!!",matchObj.group())
        matchObj_sub=re.sub(r'(.*)run(.*)',r'\1rruunn\2',line)
        F1.write(matchObj_sub)
    else:
        print(line,end='') # end='' can ignore "\n" from variable "line"
        pass
F.close
F1.close

執行結果：

  qilei@GKCSX091 MINGW32 ~/project/studyEnglish (master)
    $ ./setup.py
    nihao
    word
    456
    hello
    nihao
    world
    456
    hello
    ['hello', 'world', '\n', 'welcome']
    ['hello world ', ' welcome']
    ['hello', 'world', 'welcome']
    ['hello', 'world', '', '', 'welcome']
    ['hello world ', ' welcome']
    ['', ' ', ' \n ', '']
    total 1132
    drwxr-xr-x 1 qilei 1049089       0 9月  16 17:52 .
    drwxr-xr-x 1 qilei 1049089       0 9月  10 15:34 ..
    -rw-r--r-- 1 qilei 1049089 1150390 9月  27  2018 Arete Research - AI Silicon Rage Against the Machines.pdf
    -rwxr-xr-x 1 qilei 1049089    1434 9月  16 17:51 setup.py
    
    42
    #!/usr/bin/env python
    
    # readme
    # 1. print need () in python 3.x
    # 2. recommend re.split, no string.split
    # 3. print will add "'n" default. """print(line,end='')""" in python 3.x; """print line,""" in python 2.x .
    
    import os;
    import re;
    import sys; # for debug
    
    # list var
    list=["nihao","123",456,"hello"]
    list[1]='word'
    for i in list:
        print(i)
    # string replace
    list[1]=list[1].replace("word","world")
    for i in list:
        print(i)
    # recommend re.split, no string.split
    str="hello world \n welcome"
    print(str.split(' '))
    print(str.split('\n'))
    # re.split
    str="hello world \n welcome"
    print(re.split(r'\s+',str))
    print(re.split(r' |\n',str))
    print(re.split(r'\n+',str))
    print(re.split(r'\w+',str))
    
    
    # shell command in common
    os.system(r'rm -f out.log')
    # shell command should return value
    P=os.popen('ls -al','r')
    output=P.read()
    print(output)
    P.close
    
    # for debug
    print(sys._getframe().f_lineno)
    
    os.system(r'rm -f out.log')
    # re.search()
    # re.sub()
    # like perl process file with regexp
    # read file from setup.py
    # write file to out.log
    F=open("setup.py","r")
    F1=open("out.log","w")
    for line in F:
    !!!!!!!!!!!!!Match!!!!!!!!!!!     matchObj=re.search(r'(.*)run(.*)',line)
        if matchObj:
            print("!!!!!!!!!!!!!Match!!!!!!!!!!!",matchObj.group())
    !!!!!!!!!!!!!Match!!!!!!!!!!!         matchObj_sub=re.sub(r'(.*)run(.*)',r'\1rruunn\2',line)
            F1.write(matchObj_sub)
        else:
            print(line,end='') # end='' can ignore "\n" from variable "line"
            pass
    F.close
    F1.close
    
    qilei@GKCSX091 MINGW32 ~/project/studyEnglish (master)
    $ cat out.log
        matchObj=re.search(r'(.*)rruunn(.*)',line)
            matchObj_sub=re.sub(r'(.*)rruunn(.*)',r'\1rruunn\2',line)
    
    qilei@GKCSX091 MINGW32 ~/project/studyEnglish (master)
    $