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1

I'm trying to read and write a file with python file system but I'm having some problems. I believe that the reading/opening function is correct but the writing one is giving me a hard time.

I'm doing it inside a function that inverts a dictionary and I want it to read the dictionary from a text file instead of doing it inside the code, here's how I called it(not beautifully but works):

d = fin = open('dict.txt')

However, when it comes to writing the inverted dictionary to a file I'm failing miserably. The function call that prints the inverted dict is invert_dict(d) so I thought that I should try to write it like this:

invert_dict(d) = fout = open('output.txt', 'w')

Which is clearly wrong but that's what I got from reading a book. Here's my raw invert dictionary function :

def invert_dict(d):
 print(' the dictionary is n' , d)
 inverse = dict()
 for key in d:
 val = d[key]
 for i in val:
 if i not in inverse:
 inverse[i] = [key]
 else:
 inverse[i].append(key)
 return inverse
d='vowels':['a','e','i','o','u'], 'letters':['a','b','c','d']
print(invert_dict(d))

How should I improve my code? Thanks in advance.

python python-3.x

share|improve this question

edited Mar 27 at 8:47

martineau

74.5k1111 gold badges101101 silver badges193193 bronze badges

asked Mar 27 at 8:31

BrunoBruno

2233 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  if you want it to be properly, first use 'with open' construct (pythonforbeginners.com/files/…); also try to separate functionality - avoid creating superclass or supermethod in this case that does everything
  
  – Drako
  Mar 27 at 8:36
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Drako Sweet, so instead of using the ugly d = fin = open('dict.txt') I can use with open(“dict.txt”) as file:? Appreciate it! Regarding writing my output in a text file, thoughts? :)
  
  – Bruno
  Mar 27 at 8:43
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Bruno see my edit?
  
  – U10-Forward
  Mar 27 at 8:45
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @U9-Forward Yes sir, thanks
  
  – Bruno
  Mar 27 at 8:50
  

  
  
  
  

add a comment | 

1

I'm trying to read and write a file with python file system but I'm having some problems. I believe that the reading/opening function is correct but the writing one is giving me a hard time.

I'm doing it inside a function that inverts a dictionary and I want it to read the dictionary from a text file instead of doing it inside the code, here's how I called it(not beautifully but works):

d = fin = open('dict.txt')

However, when it comes to writing the inverted dictionary to a file I'm failing miserably. The function call that prints the inverted dict is invert_dict(d) so I thought that I should try to write it like this:

invert_dict(d) = fout = open('output.txt', 'w')

Which is clearly wrong but that's what I got from reading a book. Here's my raw invert dictionary function :

def invert_dict(d):
 print(' the dictionary is n' , d)
 inverse = dict()
 for key in d:
 val = d[key]
 for i in val:
 if i not in inverse:
 inverse[i] = [key]
 else:
 inverse[i].append(key)
 return inverse
d='vowels':['a','e','i','o','u'], 'letters':['a','b','c','d']
print(invert_dict(d))

How should I improve my code? Thanks in advance.

python python-3.x

share|improve this question

edited Mar 27 at 8:47

martineau

74.5k1111 gold badges101101 silver badges193193 bronze badges

asked Mar 27 at 8:31

BrunoBruno

2233 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  if you want it to be properly, first use 'with open' construct (pythonforbeginners.com/files/…); also try to separate functionality - avoid creating superclass or supermethod in this case that does everything
  
  – Drako
  Mar 27 at 8:36
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Drako Sweet, so instead of using the ugly d = fin = open('dict.txt') I can use with open(“dict.txt”) as file:? Appreciate it! Regarding writing my output in a text file, thoughts? :)
  
  – Bruno
  Mar 27 at 8:43
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Bruno see my edit?
  
  – U10-Forward
  Mar 27 at 8:45
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @U9-Forward Yes sir, thanks
  
  – Bruno
  Mar 27 at 8:50
  

  
  
  
  

add a comment | 

I'm trying to read and write a file with python file system but I'm having some problems. I believe that the reading/opening function is correct but the writing one is giving me a hard time.

I'm doing it inside a function that inverts a dictionary and I want it to read the dictionary from a text file instead of doing it inside the code, here's how I called it(not beautifully but works):

d = fin = open('dict.txt')

However, when it comes to writing the inverted dictionary to a file I'm failing miserably. The function call that prints the inverted dict is invert_dict(d) so I thought that I should try to write it like this:

invert_dict(d) = fout = open('output.txt', 'w')

Which is clearly wrong but that's what I got from reading a book. Here's my raw invert dictionary function :

def invert_dict(d):
 print(' the dictionary is n' , d)
 inverse = dict()
 for key in d:
 val = d[key]
 for i in val:
 if i not in inverse:
 inverse[i] = [key]
 else:
 inverse[i].append(key)
 return inverse
d='vowels':['a','e','i','o','u'], 'letters':['a','b','c','d']
print(invert_dict(d))

How should I improve my code? Thanks in advance.

python python-3.x

share|improve this question

edited Mar 27 at 8:47

martineau

74.5k1111 gold badges101101 silver badges193193 bronze badges

asked Mar 27 at 8:31

BrunoBruno

2233 bronze badges

d = fin = open('dict.txt')

invert_dict(d) = fout = open('output.txt', 'w')

def invert_dict(d):
 print(' the dictionary is n' , d)
 inverse = dict()
 for key in d:
 val = d[key]
 for i in val:
 if i not in inverse:
 inverse[i] = [key]
 else:
 inverse[i].append(key)
 return inverse
d='vowels':['a','e','i','o','u'], 'letters':['a','b','c','d']
print(invert_dict(d))

share|improve this question

edited Mar 27 at 8:47

martineau

74.5k1111 gold badges101101 silver badges193193 bronze badges

asked Mar 27 at 8:31

BrunoBruno

2233 bronze badges

share|improve this question

edited Mar 27 at 8:47

martineau

74.5k1111 gold badges101101 silver badges193193 bronze badges

asked Mar 27 at 8:31

BrunoBruno

2233 bronze badges

edited Mar 27 at 8:47

martineau

74.5k1111 gold badges101101 silver badges193193 bronze badges

edited Mar 27 at 8:47

martineau

74.5k1111 gold badges101101 silver badges193193 bronze badges

asked Mar 27 at 8:31

BrunoBruno

2233 bronze badges

asked Mar 27 at 8:31

BrunoBruno

2233 bronze badges

1 Answer
1

active

oldest

votes

1

Your code is pretty good, just using items to loop is better, and also setdefault is easier:

def invert_dict(d):
 print(' the dictionary is n' , d)
 inverse = 
 for k,v in d.items():
 for i in v:
 inverse.setdefault(i,[]).append(k)
 return inverse

edit:

Misunderstood before, so you should use:

import json
d = fin = json.loads(open('dict.txt'))
with open('output.txt', 'w') as fout:
 fout.write(invert_dict(d))

share|improve this answer

edited Mar 27 at 8:42

answered Mar 27 at 8:34

U10-ForwardU10-Forward

27.6k55 gold badges2121 silver badges4848 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Thanks! Regarding writing the inverted dictionary though, thoughts? :)
  
  – Bruno
  Mar 27 at 8:36
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @Bruno I think this is the best as it gets :-) remember to accept and up-vote if it is good :-)
  
  – U10-Forward
  Mar 27 at 8:37
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Again, appreciate your comment regarding this function, it took me a while to do it! However, maybe I didn't make myself clear, my issue is not with this function per se. I wanna change it through fin and fout function, which is the subject that I'm studying at the moment
  
  – Bruno
  Mar 27 at 8:40
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @Bruno Edited my answer
  
  – U10-Forward
  Mar 27 at 8:42
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Now I got it, thanks! So every time that I'm exchanging data I should import json and then carry on from there. Appreciate a lot your time, now I can carry on with my studies, thank you very much!
  
  – Bruno
  Mar 27 at 8:49
  

  
  
  
  

add a comment | 

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1

Your code is pretty good, just using items to loop is better, and also setdefault is easier:

def invert_dict(d):
 print(' the dictionary is n' , d)
 inverse = 
 for k,v in d.items():
 for i in v:
 inverse.setdefault(i,[]).append(k)
 return inverse

edit:

Misunderstood before, so you should use:

import json
d = fin = json.loads(open('dict.txt'))
with open('output.txt', 'w') as fout:
 fout.write(invert_dict(d))

share|improve this answer

edited Mar 27 at 8:42

answered Mar 27 at 8:34

U10-ForwardU10-Forward

27.6k55 gold badges2121 silver badges4848 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Thanks! Regarding writing the inverted dictionary though, thoughts? :)
  
  – Bruno
  Mar 27 at 8:36
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @Bruno I think this is the best as it gets :-) remember to accept and up-vote if it is good :-)
  
  – U10-Forward
  Mar 27 at 8:37
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Again, appreciate your comment regarding this function, it took me a while to do it! However, maybe I didn't make myself clear, my issue is not with this function per se. I wanna change it through fin and fout function, which is the subject that I'm studying at the moment
  
  – Bruno
  Mar 27 at 8:40
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @Bruno Edited my answer
  
  – U10-Forward
  Mar 27 at 8:42
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Now I got it, thanks! So every time that I'm exchanging data I should import json and then carry on from there. Appreciate a lot your time, now I can carry on with my studies, thank you very much!
  
  – Bruno
  Mar 27 at 8:49
  

  
  
  
  

add a comment | 

1

Your code is pretty good, just using items to loop is better, and also setdefault is easier:

def invert_dict(d):
 print(' the dictionary is n' , d)
 inverse = 
 for k,v in d.items():
 for i in v:
 inverse.setdefault(i,[]).append(k)
 return inverse

edit:

Misunderstood before, so you should use:

import json
d = fin = json.loads(open('dict.txt'))
with open('output.txt', 'w') as fout:
 fout.write(invert_dict(d))

share|improve this answer

edited Mar 27 at 8:42

answered Mar 27 at 8:34

U10-ForwardU10-Forward

27.6k55 gold badges2121 silver badges4848 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Thanks! Regarding writing the inverted dictionary though, thoughts? :)
  
  – Bruno
  Mar 27 at 8:36
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @Bruno I think this is the best as it gets :-) remember to accept and up-vote if it is good :-)
  
  – U10-Forward
  Mar 27 at 8:37
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Again, appreciate your comment regarding this function, it took me a while to do it! However, maybe I didn't make myself clear, my issue is not with this function per se. I wanna change it through fin and fout function, which is the subject that I'm studying at the moment
  
  – Bruno
  Mar 27 at 8:40
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @Bruno Edited my answer
  
  – U10-Forward
  Mar 27 at 8:42
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Now I got it, thanks! So every time that I'm exchanging data I should import json and then carry on from there. Appreciate a lot your time, now I can carry on with my studies, thank you very much!
  
  – Bruno
  Mar 27 at 8:49
  

  
  
  
  

add a comment | 

Your code is pretty good, just using items to loop is better, and also setdefault is easier:

def invert_dict(d):
 print(' the dictionary is n' , d)
 inverse = 
 for k,v in d.items():
 for i in v:
 inverse.setdefault(i,[]).append(k)
 return inverse

edit:

Misunderstood before, so you should use:

import json
d = fin = json.loads(open('dict.txt'))
with open('output.txt', 'w') as fout:
 fout.write(invert_dict(d))

share|improve this answer

edited Mar 27 at 8:42

answered Mar 27 at 8:34

U10-ForwardU10-Forward

27.6k55 gold badges2121 silver badges4848 bronze badges

def invert_dict(d):
 print(' the dictionary is n' , d)
 inverse = 
 for k,v in d.items():
 for i in v:
 inverse.setdefault(i,[]).append(k)
 return inverse

import json
d = fin = json.loads(open('dict.txt'))
with open('output.txt', 'w') as fout:
 fout.write(invert_dict(d))

share|improve this answer

edited Mar 27 at 8:42

answered Mar 27 at 8:34

U10-ForwardU10-Forward

27.6k55 gold badges2121 silver badges4848 bronze badges

answered Mar 27 at 8:34

U10-ForwardU10-Forward

27.6k55 gold badges2121 silver badges4848 bronze badges

answered Mar 27 at 8:34

U10-ForwardU10-Forward

27.6k55 gold badges2121 silver badges4848 bronze badges