Python_检查程序规范

 '''
     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
 '''
 import sys
 import re

 def checkFormats(lines,desFileName):
     fp=open(desFileName,'w')
     for i, line in enumerate(lines):
         print('='*30)
         print('Line:',i+1)
         if line.strip().startwith('#'):
             print(' '*10+'Comments.Pass.')
             fp.write(line)
             continue
         flag=True
         #check operator symbols
         symbols=[',','+','-','*','/','//','**','>>','<<','+=','-=','*=','/=']
         temp_line=line
         for symbol in symbols:
             pattern=re.compile(r'\s*'+re.escape(symbol)+r'\s*')
             temp_lie=pattern.split(temp_line)
             sep=' '+symbol+' '
             temp_line=sep.join(temp_line)
         if line !=temp_line:
             flag=False
             print(' '*10+'You may miss some blank spaces in this line.' )
         #check import statement
         if line.strip().startwith('import'):
             if ',' in line:
                 flag = False
                 print(' '*10+"You'd bbetter import one module at a time.")
                 temp_line=line.strip()
                 modules=modules.strip()
                 pattern=re.compile(r'\s*,\s*')
                 modules=pattern.split(modules)
                 temp_line=''
                 for module in modules:
                     temp_line +=line[:line.index('import')] + 'import '+module+'\n'
                 line=temp_line
             pri_line=lines[i-1].strip()
             if pri_line and(not pri_line.startwith('import'))and (not pri_line.startwith('#')):
                 falg=False
                 print(' '*10+'You should add a blank line before this line.')
                 line='\n'+line
             after_line=lines[i+1].strip()
             if after_line and(not after_line.startwith('import')):
                 flag=False
                 print(' '*10+'You should add a blank line after this line.')
                 line=line+'\n'
         #check if there is a blank line before new funtional code block
         #including the class/function definition
             if line.strip() and not line.startswith(' ')and i>0:
                 pri_line=lines[i-1]
                 if pri_line.strip() and pri_line.startwith(' '):
                     flag=False
                     print(' '*10 +"You'd better add a blank line before this line.")
                     line='\n'+line
             if flag:
                 print(' '*10+'Pass.')
             fp.write(line)
     fp.close()

 if __name__ == '__main__':
     fileName=sys.argv[1]    #命令行参数
     fileLines=[]
     with open(fileName,'r') as fp:
         fileLines=fp.readline()
     desFileName=fileName[:-3]+'_new.py'
     checkFormats(fileLines,desFileName)
     #check the ratio of comment lines to all lines
     comments=[line for line in fileLines if line.strip().startswith('#')]
     ratio=len(comments)/len(fileLines)
     if ratio <= 0.3:
         print('='*30)
         print('Comments in the file is less than 30%')
         print('Perhaps you should add some comments at appropriate position.')