Writing python code to convert linux read, write and execute octal format to the string

user_13473647 0
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The permissions of a file in a Linux system are split into three sets of three permissions: read, write, and execute for the owner, group, and others. Each of the three values can be expressed as an octal number summing each permission, with 4 corresponding to read, 2 to write, and 1 to execute. Or it can be written with a string using the letters r, w, and x or - when the permission is not granted. For example: 640 is read/write for the owner, read for the group, and no permissions for the others; converted to a string, it would be: "rw-r-----" 755 is read/write/execute for the owner, and read/execute for group and others; converted to a string, it would be: "rwxr-xr-x" Fill in the blanks to make the code convert a permission in octal format into a string format.

def octal_to_string(octal):
  result = ""
  value_letters = [(4,"r"),(2,"w"),(1,"x")]
  # Iterate over each of the digits in octal
  for ___ in [int(n) for n in str(octal)]:
      # Check for each of the permissions values
      for value, letter in value_letters:
          if ___ >= value:
              result += ___
              ___ -= value
          else:
              ___
  return result

print(octal_to_string(755)) # Should be rwxr-xr-x
print(octal_to_string(644)) # Should be rw-r--r--
print(octal_to_string(750)) # Should be rwxr-x---
print(octal_to_string(600)) # Should be rw-------

Please help me to fix this problem

python
6 Answers

  • An easier way.

    def octal_to_string(octal):
    permission = ["---", "--x", "-w-", "-wx", "r--", "r-x", "rw-", "rwx"]
    result = ""
    # Iterate over each of the digits in octal
    for ___ in [int(n) for n in str(octal)]:
        result += permission[___]
    return result

print(octal_to_string(755)) 
print(octal_to_string(644)) 
print(octal_to_string(750)) 
print(octal_to_string(600))

Output1

  • According to your logic.

    def octal_to_string(octal):
   result = ""
   value_letters = [(4,"r"),(2,"w"),(1,"x")]
   # Iterate over each of the digits in octal
   for ___ in [int(n) for n in str(octal)]:
      # Check for each of the permissions values
      for value, letter in value_letters:
          if ___ >= value:
               result += letter
               ___ -= value
          else:
               result += "-"
   return result

print(octal_to_string(755))
print(octal_to_string(644))
print(octal_to_string(750))
print(octal_to_string(600))

Output2

user_124601950 
def octal_to_string(octal):
 result = ""
 value_letters = [(4,"r"),(2,"w"),(1,"x")]
 # Iterate over each of the digits in octal
 for i in [int(n) for n in str(octal)]:
    # Check for each of the permissions values
    for value, letter in value_letters:
        if i >= value:
            result += letter
            i -= value
        else:
            result += '-'
 return result
user_131560170 
def octal_to_string(octal):
    result = ""
    value_letters = [(4,"r"),(2,"w"),(1,"x")]
    # Iterate over each of the digits in octal
    for x in [int(n) for n in str(octal)]:
        # Check for each of the permissions values
        for value, letter in value_letters:
            if x >= value:
                result += letter
                x -= value
            else:
                result += "-"
    return result
user_103169980 
def octal_to_string(octal):
    result = ""
    value_letters = [(4,"r"),(2,"w"),(1,"x")]
    # Iterate over each of the digits in octal
    for i in [int(n) for n in str(octal)]:
        # Check for each of the permissions values
        for value, letter in value_letters:
            if i >= value:
                result += letter
                i -= value
            else:
                result += "-"
    return result
    
print(octal_to_string(755)) # Should be rwxr-xr-x
print(octal_to_string(644)) # Should be rw-r--r--
print(octal_to_string(750)) # Should be rwxr-x---
print(octal_to_string(600)) # Should be rw-------
user_181003400 
def octal_to_string(octal):
    result = ""
    value_letters = [(4,"r"),(2,"w"),(1,"x")]
    # Iterate over each of the digits in octal
    for y in [int(n) for n in str(octal)]:
        # Check for each of the permissions values
        for value, letter in value_letters:
            if y >= value:
                result += letter
                y-= value
            else:
                result+="-"
    return result

print(octal_to_string(755))

rwxr-xr-x

user_71594060 
def octal_to_string(octal):
    result = ""
    value_letters = [(4,"r"),(2,"w"),(1,"x")]
    # Iterate over each of the digits in octal
    for x in [int(n) for n in str(octal)]:
        # Check for each of the permissions values
        for value, letter in value_letters:
            if x >= value:
                result += letter
                x -= value
            else:
                result +="-"
    return result
    
print(octal_to_string(755)) # Should be rwxr-xr-x
print(octal_to_string(644)) # Should be rw-r--r--
print(octal_to_string(750)) # Should be rwxr-x---
print(octal_to_string(600)) # Should be rw-------
user_157545500
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