python - 通过命令行运行这个python程序

Question

我需要通过命令行运行这个 python 程序，但我不知道该怎么做。在执行此操作之前，您应该修改 PATH 环境变量，对吗？如果有帮助的话，我正在使用 python 3.5。

from sys import argv

DEFAULT_KEY = 3

def main() :
   key = DEFAULT_KEY
   inFile = ""
   outFile = ""

   files = 0   # Number of command line arguments that are files.
   for i in range(1, len(argv)) :
      arg = argv[i]
      if arg[0] == "-" :
         # It is a command line option.
         option = arg[1]
         if option == "d" :
            key = -key
         else :
            usage()
            return

      else :
         # It is a file name
         files = files + 1
         if files == 1 :
            inFile = arg
         elif files == 2 :
            outFile = arg

   # There must be two files.
   if files != 2 :
      usage() 
      return 

   # Open the files.
   inputFile = open(inFile, "r")
   outputFile = open(outFile, "w")

   # Read the characters from the file.
   for line in inputFile :
      for char in line :
         newChar = encrypt(char, key)
         outputFile.write(newChar)

   # Close the files.
   inputFile.close()
   outputFile.close()

## Encrypts upper- and lowercase characters by shifting them according to a key.
#  @param ch the letter to be encrypted
#  @param key the encryption key
#  @return the encrypted letter      
#
def encrypt(ch, key) :
   LETTERS = 26   # Number of letters in the Roman alphabet.

   if ch >= "A" and ch <= "Z" :
      base = ord("A")
   elif ch >= "a" and ch <= "z" :
      base = ord("a")
   else :
      return ch    # Not a letter.

   offset = ord(ch) - base + key
   if offset > LETTERS :
      offset = offset - LETTERS
   elif offset < 0 :
      offset = offset + LETTERS 

   return chr(base + offset)

## Prints a message describing proper usage.
#
def usage() :
   print("Usage: python cipher.py [-d] infile outfile")

# Start the program.
main()

Answer 1

你有没有尝试过...

C:>python code.py 参数

如果上述方法失败，请检查此链接以了解如何设置路径变量。 How to add to the pythonpath in windows 7?