working with Python Dictionary
working with Python Dictionary
I have the code below :
When I run it , I get the result below:
The question is why I am getting the "None" ?
Thank you
I have the code below :
message=input(">")
words=message.split(' ')
print (words)
emoh={
":)":"😂",
":(":"😒"
}
output=""
for word in words:
print(word,word,word,word,word)
print (emoh.get(word))
output+= (emoh.get(word,word))
print (output)
When I run it , I get the result below:
The question is why I am getting the "None" ?
Thank you
Do more with
EXPERT OFFICE® is a registered trademark of EXPERTS EXCHANGE®
That is because the word is not in dictionary. You probably want to use:
A side note: Python strings are immutable. This means that they cannot be modified. This means that the output += emoh.get(word, word) always constructs a new string and throws away the older content. That can be very inefficient if you use large texts.
emoh.get(word, word)
A side note: Python strings are immutable. This means that they cannot be modified. This means that the output += emoh.get(word, word) always constructs a new string and throws away the older content. That can be very inefficient if you use large texts.
in this code, you have used get keyword for getting the value of a key from the dictionary. if a key is present in the dictionary then this will give you value else it will give you none.
in this code you have used "print(emoh.get(word))" here it is giving you "None" because that word is not present in "emoh".
in this code you have used "print(emoh.get(word))" here it is giving you "None" because that word is not present in "emoh".
As other two experts mentioned, you are getting None because the keys you are trying to find in the dictionary don't exist.
The keys in the dictionary which exist are ":)" and ":(" whereas you are trying to find the keys "aaaa" and "bbbb" assuming your input was "aaaa bbbb" which don't exist at all in the dictionary.
Assuming your input is "aaaa bbbb" or two words separated by a space, the following code will give you the desired output.
The keys in the dictionary which exist are ":)" and ":(" whereas you are trying to find the keys "aaaa" and "bbbb" assuming your input was "aaaa bbbb" which don't exist at all in the dictionary.
Assuming your input is "aaaa bbbb" or two words separated by a space, the following code will give you the desired output.
message=input(">")
words=message.split(' ')
print (words)
emoh={
words[0]:"😂",
words[1]:"😒"
}
output=""
for word in words:
print(word,word,word,word,word)
print (emoh.get(word))
output+= (emoh.get(word,word))
print (output)
A short comment on the "get" method.
"get" can accept 2 parameters. The first one is the key to retrieve from the dictionary.
The second, optional parameter, is the value to return if the key is not found. If not specified, the value will be None
If we specify the second value, then if the key is not found, then the second value is returned.
so, the expression
"get" can accept 2 parameters. The first one is the key to retrieve from the dictionary.
>>> dd = {"foo" : "bar"}
>>> print( dd.get("foo") )
bar
The second, optional parameter, is the value to return if the key is not found. If not specified, the value will be None
>>> print( dd.get("bar") )
None
If we specify the second value, then if the key is not found, then the second value is returned.
>>> print( dd.get("bar", "baz") )
baz
>>> print( dd.get("foo", "baz"))
bar
so, the expression
something=emoh.get(word,word)
if word in emoh:
something=emoh[word]
else:
something=word
Premium Content
You need an Expert Office subscription to comment.Start Free Trial