1 ‘‘‘
 2     检查Python程序的一些基本规范，例如，运算符两测是否有空格，是否每次只导入一个模块，在不同的功能模块之间是否有空行，注释是否够多，等等
 3 ‘‘‘
 4 import sys
 5 import re
 6 
 7 def checkFormats(lines,desFileName):
 8     fp=open(desFileName,‘w‘)
 9     for i, line in enumerate(lines):
10         print(‘=‘*30)
11         print(‘Line:‘,i+1)
12         if line.strip().startwith(‘#‘):
13             print(‘ ‘*10+‘Comments.Pass.‘)
14             fp.write(line)
15             continue
16         flag=True
17         #check operator symbols
18         symbols=[‘,‘,‘+‘,‘-‘,‘*‘,‘/‘,‘//‘,‘**‘,‘>>‘,‘<<‘,‘+=‘,‘-=‘,‘*=‘,‘/=‘]
19         temp_line=line
20         for symbol in symbols:
21             pattern=re.compile(r‘\s*‘+re.escape(symbol)+r‘\s*‘)
22             temp_lie=pattern.split(temp_line)
23             sep=‘ ‘+symbol+‘ ‘
24             temp_line=sep.join(temp_line)
25         if line !=temp_line:
26             flag=False
27             print(‘ ‘*10+‘You may miss some blank spaces in this line.‘ )
28         #check import statement
29         if line.strip().startwith(‘import‘):
30             if ‘,‘ in line:
31                 flag = False
32                 print(‘ ‘*10+"You‘d bbetter import one module at a time.")
33                 temp_line=line.strip()
34                 modules=modules.strip()
35                 pattern=re.compile(r‘\s*,\s*‘)
36                 modules=pattern.split(modules)
37                 temp_line=‘‘
38                 for module in modules:
39                     temp_line +=line[:line.index(‘import‘)] + ‘import ‘+module+‘\n‘
40                 line=temp_line
41             pri_line=lines[i-1].strip()
42             if pri_line and(not pri_line.startwith(‘import‘))and (not pri_line.startwith(‘#‘)):
43                 falg=False
44                 print(‘ ‘*10+‘You should add a blank line before this line.‘)
45                 line=‘\n‘+line
46             after_line=lines[i+1].strip()
47             if after_line and(not after_line.startwith(‘import‘)):
48                 flag=False
49                 print(‘ ‘*10+‘You should add a blank line after this line.‘)
50                 line=line+‘\n‘
51         #check if there is a blank line before new funtional code block
52         #including the class/function definition
53             if line.strip() and not line.startswith(‘ ‘)and i>0:
54                 pri_line=lines[i-1]
55                 if pri_line.strip() and pri_line.startwith(‘ ‘):
56                     flag=False
57                     print(‘ ‘*10 +"You‘d better add a blank line before this line.")
58                     line=‘\n‘+line
59             if flag:
60                 print(‘ ‘*10+‘Pass.‘)
61             fp.write(line)
62     fp.close()
63 
64 if __name__ == ‘__main__‘:
65     fileName=sys.argv[1]    #命令行参数
66     fileLines=[]
67     with open(fileName,‘r‘) as fp:
68         fileLines=fp.readline()
69     desFileName=fileName[:-3]+‘_new.py‘
70     checkFormats(fileLines,desFileName)
71     #check the ratio of comment lines to all lines
72     comments=[line for line in fileLines if line.strip().startswith(‘#‘)]
73     ratio=len(comments)/len(fileLines)
74     if ratio <= 0.3:
75         print(‘=‘*30)
76         print(‘Comments in the file is less than 30%‘)
77         print(‘Perhaps you should add some comments at appropriate position.‘)