Accessing values from dictionaries nested in a list











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First question here!



countries = [{'country': 'Italy', 'size':3,'reg':9},
{'country': 'Germany', 'size':7,'reg':1},
{'country': 'USA', 'size':9,'reg':4},
]

weights = {'size' : 100, 'reg' : 30}


I am trying to multiply values from the 'countries' nested dictionaries with the value associated with the matching key in the 'weights' dictionary. I tried a for loop approach as the values in 'weights' will be updated by the user.



I have tried this:



countries_weighted = copy.deepcopy(countries)

for key in weights.items():
for i in countries_weighted:
countries_weighted[i][key] *= weights[key]


That doesn't seem to work:



-
TypeError Traceback (most recent call last)
<ipython-input-52-9753dabe7648> in <module>()
13 for key in weights.items():
14 for i in countries_weighted:
---> 15 countries_weighted[i][key] *= weights[key]
16

TypeError: list indices must be integers or slices, not dict


Any idea? Thanks in advance.










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  • for i in countries_weighted: will return the values in countries_weighted to your variable i, not the index. So in this case i gets an entire dictionary each time. So replacing countries_weighted[i][key] *= weights[key] with i[key] *= weights[key] should work for you. But Esteban Quiros's code below is much cleaner
    – Dan
    Nov 22 at 16:47















up vote
0
down vote

favorite












First question here!



countries = [{'country': 'Italy', 'size':3,'reg':9},
{'country': 'Germany', 'size':7,'reg':1},
{'country': 'USA', 'size':9,'reg':4},
]

weights = {'size' : 100, 'reg' : 30}


I am trying to multiply values from the 'countries' nested dictionaries with the value associated with the matching key in the 'weights' dictionary. I tried a for loop approach as the values in 'weights' will be updated by the user.



I have tried this:



countries_weighted = copy.deepcopy(countries)

for key in weights.items():
for i in countries_weighted:
countries_weighted[i][key] *= weights[key]


That doesn't seem to work:



-
TypeError Traceback (most recent call last)
<ipython-input-52-9753dabe7648> in <module>()
13 for key in weights.items():
14 for i in countries_weighted:
---> 15 countries_weighted[i][key] *= weights[key]
16

TypeError: list indices must be integers or slices, not dict


Any idea? Thanks in advance.










share|improve this question
























  • for i in countries_weighted: will return the values in countries_weighted to your variable i, not the index. So in this case i gets an entire dictionary each time. So replacing countries_weighted[i][key] *= weights[key] with i[key] *= weights[key] should work for you. But Esteban Quiros's code below is much cleaner
    – Dan
    Nov 22 at 16:47













up vote
0
down vote

favorite









up vote
0
down vote

favorite











First question here!



countries = [{'country': 'Italy', 'size':3,'reg':9},
{'country': 'Germany', 'size':7,'reg':1},
{'country': 'USA', 'size':9,'reg':4},
]

weights = {'size' : 100, 'reg' : 30}


I am trying to multiply values from the 'countries' nested dictionaries with the value associated with the matching key in the 'weights' dictionary. I tried a for loop approach as the values in 'weights' will be updated by the user.



I have tried this:



countries_weighted = copy.deepcopy(countries)

for key in weights.items():
for i in countries_weighted:
countries_weighted[i][key] *= weights[key]


That doesn't seem to work:



-
TypeError Traceback (most recent call last)
<ipython-input-52-9753dabe7648> in <module>()
13 for key in weights.items():
14 for i in countries_weighted:
---> 15 countries_weighted[i][key] *= weights[key]
16

TypeError: list indices must be integers or slices, not dict


Any idea? Thanks in advance.










share|improve this question















First question here!



countries = [{'country': 'Italy', 'size':3,'reg':9},
{'country': 'Germany', 'size':7,'reg':1},
{'country': 'USA', 'size':9,'reg':4},
]

weights = {'size' : 100, 'reg' : 30}


I am trying to multiply values from the 'countries' nested dictionaries with the value associated with the matching key in the 'weights' dictionary. I tried a for loop approach as the values in 'weights' will be updated by the user.



I have tried this:



countries_weighted = copy.deepcopy(countries)

for key in weights.items():
for i in countries_weighted:
countries_weighted[i][key] *= weights[key]


That doesn't seem to work:



-
TypeError Traceback (most recent call last)
<ipython-input-52-9753dabe7648> in <module>()
13 for key in weights.items():
14 for i in countries_weighted:
---> 15 countries_weighted[i][key] *= weights[key]
16

TypeError: list indices must be integers or slices, not dict


Any idea? Thanks in advance.







python python-3.x list dictionary for-loop






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edited Nov 22 at 16:50









jpp

89.5k1952100




89.5k1952100










asked Nov 22 at 16:36









dpppstl

1




1












  • for i in countries_weighted: will return the values in countries_weighted to your variable i, not the index. So in this case i gets an entire dictionary each time. So replacing countries_weighted[i][key] *= weights[key] with i[key] *= weights[key] should work for you. But Esteban Quiros's code below is much cleaner
    – Dan
    Nov 22 at 16:47


















  • for i in countries_weighted: will return the values in countries_weighted to your variable i, not the index. So in this case i gets an entire dictionary each time. So replacing countries_weighted[i][key] *= weights[key] with i[key] *= weights[key] should work for you. But Esteban Quiros's code below is much cleaner
    – Dan
    Nov 22 at 16:47
















for i in countries_weighted: will return the values in countries_weighted to your variable i, not the index. So in this case i gets an entire dictionary each time. So replacing countries_weighted[i][key] *= weights[key] with i[key] *= weights[key] should work for you. But Esteban Quiros's code below is much cleaner
– Dan
Nov 22 at 16:47




for i in countries_weighted: will return the values in countries_weighted to your variable i, not the index. So in this case i gets an entire dictionary each time. So replacing countries_weighted[i][key] *= weights[key] with i[key] *= weights[key] should work for you. But Esteban Quiros's code below is much cleaner
– Dan
Nov 22 at 16:47












3 Answers
3






active

oldest

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up vote
2
down vote













You could do it like this:



countries = [{'country': 'Italy', 'size':3,'reg':9},
{'country': 'Germany', 'size':7,'reg':1},
{'country': 'USA', 'size':9,'reg':4},
]

weights = {'size' : 100, 'reg' : 30}

for country in countries:
for key in weights.keys():
country[key] *= weights[key]

print(countries)





share|improve this answer























  • Makes sense.hank you Esteban Quiros, Dan and JPP for your help!
    – dpppstl
    Nov 23 at 15:12


















up vote
0
down vote













There are a couple of issues:





  1. dict.items cycles key-value pairs, not just keys;

  2. when you iterate countries_weighted you should use i.


So you can amend as follows:



for key, value in weights.items():
for i in countries_weighted:
i[key] *= value





share|improve this answer




























    up vote
    0
    down vote













    Only need to write countries_weighted[i][key] *= weights[key] as i[key] *= weights[key].






    share|improve this answer





















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      3 Answers
      3






      active

      oldest

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      3 Answers
      3






      active

      oldest

      votes









      active

      oldest

      votes






      active

      oldest

      votes








      up vote
      2
      down vote













      You could do it like this:



      countries = [{'country': 'Italy', 'size':3,'reg':9},
      {'country': 'Germany', 'size':7,'reg':1},
      {'country': 'USA', 'size':9,'reg':4},
      ]

      weights = {'size' : 100, 'reg' : 30}

      for country in countries:
      for key in weights.keys():
      country[key] *= weights[key]

      print(countries)





      share|improve this answer























      • Makes sense.hank you Esteban Quiros, Dan and JPP for your help!
        – dpppstl
        Nov 23 at 15:12















      up vote
      2
      down vote













      You could do it like this:



      countries = [{'country': 'Italy', 'size':3,'reg':9},
      {'country': 'Germany', 'size':7,'reg':1},
      {'country': 'USA', 'size':9,'reg':4},
      ]

      weights = {'size' : 100, 'reg' : 30}

      for country in countries:
      for key in weights.keys():
      country[key] *= weights[key]

      print(countries)





      share|improve this answer























      • Makes sense.hank you Esteban Quiros, Dan and JPP for your help!
        – dpppstl
        Nov 23 at 15:12













      up vote
      2
      down vote










      up vote
      2
      down vote









      You could do it like this:



      countries = [{'country': 'Italy', 'size':3,'reg':9},
      {'country': 'Germany', 'size':7,'reg':1},
      {'country': 'USA', 'size':9,'reg':4},
      ]

      weights = {'size' : 100, 'reg' : 30}

      for country in countries:
      for key in weights.keys():
      country[key] *= weights[key]

      print(countries)





      share|improve this answer














      You could do it like this:



      countries = [{'country': 'Italy', 'size':3,'reg':9},
      {'country': 'Germany', 'size':7,'reg':1},
      {'country': 'USA', 'size':9,'reg':4},
      ]

      weights = {'size' : 100, 'reg' : 30}

      for country in countries:
      for key in weights.keys():
      country[key] *= weights[key]

      print(countries)






      share|improve this answer














      share|improve this answer



      share|improve this answer








      edited Nov 22 at 16:47

























      answered Nov 22 at 16:42









      Esteban Quiros

      1015




      1015












      • Makes sense.hank you Esteban Quiros, Dan and JPP for your help!
        – dpppstl
        Nov 23 at 15:12


















      • Makes sense.hank you Esteban Quiros, Dan and JPP for your help!
        – dpppstl
        Nov 23 at 15:12
















      Makes sense.hank you Esteban Quiros, Dan and JPP for your help!
      – dpppstl
      Nov 23 at 15:12




      Makes sense.hank you Esteban Quiros, Dan and JPP for your help!
      – dpppstl
      Nov 23 at 15:12












      up vote
      0
      down vote













      There are a couple of issues:





      1. dict.items cycles key-value pairs, not just keys;

      2. when you iterate countries_weighted you should use i.


      So you can amend as follows:



      for key, value in weights.items():
      for i in countries_weighted:
      i[key] *= value





      share|improve this answer

























        up vote
        0
        down vote













        There are a couple of issues:





        1. dict.items cycles key-value pairs, not just keys;

        2. when you iterate countries_weighted you should use i.


        So you can amend as follows:



        for key, value in weights.items():
        for i in countries_weighted:
        i[key] *= value





        share|improve this answer























          up vote
          0
          down vote










          up vote
          0
          down vote









          There are a couple of issues:





          1. dict.items cycles key-value pairs, not just keys;

          2. when you iterate countries_weighted you should use i.


          So you can amend as follows:



          for key, value in weights.items():
          for i in countries_weighted:
          i[key] *= value





          share|improve this answer












          There are a couple of issues:





          1. dict.items cycles key-value pairs, not just keys;

          2. when you iterate countries_weighted you should use i.


          So you can amend as follows:



          for key, value in weights.items():
          for i in countries_weighted:
          i[key] *= value






          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered Nov 22 at 16:45









          jpp

          89.5k1952100




          89.5k1952100






















              up vote
              0
              down vote













              Only need to write countries_weighted[i][key] *= weights[key] as i[key] *= weights[key].






              share|improve this answer

























                up vote
                0
                down vote













                Only need to write countries_weighted[i][key] *= weights[key] as i[key] *= weights[key].






                share|improve this answer























                  up vote
                  0
                  down vote










                  up vote
                  0
                  down vote









                  Only need to write countries_weighted[i][key] *= weights[key] as i[key] *= weights[key].






                  share|improve this answer












                  Only need to write countries_weighted[i][key] *= weights[key] as i[key] *= weights[key].







                  share|improve this answer












                  share|improve this answer



                  share|improve this answer










                  answered Dec 4 at 9:10









                  mengxun

                  414




                  414






























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