Python case (two)

Write a program and use the program to check whether the code style of another Python program conforms to the specification

The code mainly checks some basic specifications of the Python program, such as whether there are spaces on both sides of the operator, whether only one module is imported at a time, whether there are blank lines between different function modules, and so on. (The usage method is the same as the Python case (1))

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().startswith('#'):
            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_line=pattern.aplit(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().startswith('import'):
            if ',' in line:
                flag=False
                print(' '*10+"You'd better import one module at a time.")
                temp_line=line.strip()
                modules=temp_line[temp_line.index(' ')+1:]
                modules=modules.strip()
                pattern=re.compile(r'\s*,\s*')
                modules=pattern.split(mosules)
                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.startswith('import')) and (not pri_line.startswith('#')):
                flag=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.startswith('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 functional code block
        #including the class/function definition
        if line.strip() and not pri_line.startswith(' ') and i>0:
            pri_line=lines[i-1]
            if line.strip() and pri_line.startswith(' '):
                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]
    fileLines=[]
    with open(fileName,'r') as fp:
        fileLines=fp.readlines()
    deFileName=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<=0.3:
        print('='*30)
        print('Comments in the file is less than 30%.')
        print('Perhaps you should add some comments at appropriate position.')