I am writing a function lengthWords that returns a dictionary that maps a the length of a word to a list of words from a sentence corresponding to that specific length.
Right now this is my code:
def lengthWords(string):
string = string.lower()
string = string.replace(".", "")
string = string.replace(",", "")
string = string.replace("?", "")
string = string.replace("!", "")
string = string.split()
wordDictionary = {}
for word in string:
number = len(word)
wordDictionary[number] = []
for i in range(0,len(string)):
if i == number:
wordDictionary[number].append(word)
return wordDictionary
print(lengthWords("I ate a banana."))
Right now my output is
{1: ['a'], 3: ['ate'], 6: []}
When I really need is
{1: ['i', 'a'], 3:['ate'], 6:['banana']}
What part of my code should I fix? and why isn't "banana" in the length 6 category?
def lengthWords(string):
non = ['.',',','?','!']
string = string.lower()
for x in string:
if x in non:
string = string.replace(x,'')
string = string.split()
wordDictionary = {}
for word in string:
if len(word) not in wordDictionary:
wordDictionary[len(word)] = [x for x in string if len(x) ==
len(word)]
return wordDictionary
This would be a much better approach as it checks if the length of the word the for
loop is currently on, is in the dictionary. wordDictionary[len(word)] = [x for x in string if len(x) == len(word)]
is a list of all the words with that particular length
You need to replace if i == number:
with if len(string[i])==number:
, as you want to calculate the length of the word, not it's position. Also, it is better to take the second loop outside the first one, to reduce complexity:
def lengthWords(string):
string = string.lower()
string = string.replace(".", "")
string = string.replace(",", "")
string = string.replace("?", "")
string = string.replace("!", "")
string = string.split()
wordDictionary = {}
for word in string:
number = len(word)
wordDictionary[number] = []
for i in range(0,len(string)):
wordDictionary[len(string[i])].append(string[i])
return wordDictionary
print(lengthWords("I ate a banana."))
In addition, you can use defaultdict , which enables you to remove the first loop:
from collections import defaultdict
def lengthWords(string):
string = string.lower()
string = string.replace(".", "")
string = string.replace(",", "")
string = string.replace("?", "")
string = string.replace("!", "")
string = string.split()
wordDictionary = defaultdict(list)
for i in range(0,len(string)):
wordDictionary[len(string[i])].append(string[i])
return wordDictionary
print(lengthWords("I ate a banana."))
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