python - 通过命令行运行此python程序

我需要通过命令行运行此python程序，但是我不确定如何执行此操作。您应该先修改PATH环境变量，对吗？我正在使用python 3.5，如果有帮助。

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()

最佳答案

你有没有尝试过 ...

C：> python code.py参数

如果以上操作失败，请检查此链接以了解有关设置路径变量的信息。
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