Add multiple value to a key in Python dictionary [duplicate] - python-3.x

Question

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list to dictionary conversion with multiple values per key?
(7 answers)
Closed 2 years ago.
I am trying to add multiple value to a single key(if found) from a file in python. I tried below code but getting this error: AttributeError: 'str' object has no attribute 'append'
file=open("Allwords",'r')
list=sorted(list(set([words.strip() for words in file])))
def sequence(word):
return "".join(sorted(word))
dict= {}
for word in list:
if sequence(word) in dict:
dict[sequence(word)].append(word)
else:
dict[sequence(word)]=word
Thanks in advance for your help!

Answer 1

You should insert the first element by putting it into a list, so that you can append subsequent items to it later on. You can do it as follows -
file=open("Allwords",'r')
list=sorted(list(set([words.strip() for words in file])))
def sequence(word):
return "".join(sorted(word))
dict= {}
for word in list:
if sequence(word) in dict:
dict[sequence(word)].append(word)
else:
new_lst = [word] # Inserting the first element as a list, so we can later append to it
dict[sequence(word)]=new_lst
Now you will be able to append to it properly. In your case, the value you were inserting was just a string to which you wouldn't have been able to append. But this will work, since you are inserting a list at start to which you would be able to append to .
Hope this helps !