Error while Iterating through a list

Question

[{'January': 'Sun'}, {'January': 'Sun'}, {'January': 'Sun'}, {'January': 'Sun'}]

Thats my dict.

My code to make a list of values of dict_month

dict_month = []    
jan_month= []
for x in file_st:
    a=calendar.month_name[int(x['Start Time'][5:7])] #month name
    b=parser.parse(x['Start Time']).strftime("%a")  # day name
    dict_month.append({a:b})     # [{}]

for x in dict_month:
    jan_month.append(x['January'])

The error i get is

    KeyError                                  Traceback (most recent call 
last)
<ipython-input-42-879788f99587> in <module>()
 23 
 24 for x in dict_month:
---> 25     jan_month.append(x['January'])
     26 

 KeyError: 'January'

Where is the code wrong? how do i correct it?

output [sun,sun,sun]

edit its a key error this should help.

What is the expected output? – Will Da Silva Mar 09 '18 at 05:13 — Will Da Silva, Mar 09 '18 at 05:13
@UbdusSamad file_st has timestamp yyyy-mm-dd hh-mm-ss – Chris D'mello Mar 09 '18 at 05:29 — Chris D'mello, Mar 09 '18 at 05:29
@WillDaSilva expected output is [sun,sun,sun] – Chris D'mello Mar 09 '18 at 05:30 — Chris D'mello, Mar 09 '18 at 05:30

score 2 · Answer 1 · answered Mar 09 '18 at 05:49

2

Hope it may help you:

dict_month = [{'January': 'Sun'}, {'January': 'Sun'}, {'January': 'Sun'}, {'January': 'Sun'}]  

jan_month =  [x['January'] for x in dict_month]

>>>['Sun', 'Sun', 'Sun', 'Sun']

answered Mar 09 '18 at 05:49

Veera Balla Deva

790
6
19

Sanjeev Siva · Answer 2 · 2018-03-09T05:34:08.833

1

[{'January': 'Sun'}, {'January': 'Sun'}, {'January': 'Sun'}, {'January': 'Sun'}]

Is not a dict

a dict is something that is enclosed in {}

 {'January': 'Sun', 'January': 'Sun','January': 'Sun','January': 'Sun'}

Should be your dict

Anything enclosed in a [] is a list

So technically

[{'January': 'Sun'}, {'January': 'Sun'}, {'January': 'Sun'}, {'January': 'Sun'}]

is a list, and each item of the list is a dict with 1 key,value pair

x = [{'January': 'Sun'}, {'January': 'Sun'}, {'January': 'Sun'}, {'January': 'Sun'}]

xyz = []

for y in x:
     xyz.append(y['January'])

print(xyz)

edited Mar 09 '18 at 05:34

answered Mar 09 '18 at 05:24

Sanjeev Siva

930
1
9
25

You need to understand the difference between a list and a dictionary, – Sanjeev Siva Mar 09 '18 at 05:35
A list is List literals are written within square brackets [ ] `x = [sun,mon,tue]` is a list – Sanjeev Siva Mar 09 '18 at 05:37
x = `{'January': 'Sun', 'January': 'Sun','January': 'Sun','January': 'Sun'}` january here is the key and sun is the value `key:value` – Sanjeev Siva Mar 09 '18 at 05:39
https://drive.google.com/file/d/1m5l6DbRymIWK7U5u9Y45QeGXbMzwqLbY/view?usp=sharing look at this error – Chris D'mello Mar 09 '18 at 05:48
`dict_month = [{'January': 'Sun'}, {'January': 'Sun'}, {'January': 'Sun'}, {'January': 'Sun'}] jan_month= [] for y in dict_month: jan_month.append(y['January']) print (jan_month) ` – Sanjeev Siva Mar 09 '18 at 08:10

score 1 · Answer 3 · answered Mar 09 '18 at 05:33

1

dict_month is a list of dicts and values can be append in a new list which is jan_month.

>>> dict_month = [{'January': 'Sun'}, {'January': 'Sun'}, {'January': 'Sun'}, {'January': 'Sun'}]
>>> jan_month = []
>>> for x in dict_month:
...     jan_month.append(x['January'])
...
>>> jan_month
['Sun', 'Sun', 'Sun', 'Sun']

answered Mar 09 '18 at 05:33

Fasiha

11
3

still getttig an error https://drive.google.com/file/d/1m5l6DbRymIWK7U5u9Y45QeGXbMzwqLbY/view?usp=sharing – Chris D'mello Mar 09 '18 at 05:49
Yes but it is working , it is not getting the key that's why it is throwing an error in your code.May be your dict_month is not correct and does not contain any key with name 'January' – Fasiha Mar 09 '18 at 05:51
Why is it not getting the key? – Chris D'mello Mar 09 '18 at 05:54
Show your dict_month value which you are assigning to x in your code(the code which you have shared on drive). – Atul Mishra Mar 09 '18 at 06:27

Error while Iterating through a list

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