Python dictionary get multiple values

Question

Sry if this question already exists  but I ve been searching for quite some time now   I have a dictionary in python  and what I want to do is get some values from it as a list  but I don t know if this is supported by the implementation   myDictionary get  firstKey       works fine  myDictionary get  firstKey   secondKey     gives me a KeyError - gt  OK  get is not defined for multiple keys myDictionary  firstKey   secondKey       doesn t work either   But is there any way I can achieve this  In my example it looks easy  but let s say I have a dictionary of 20 entries  and I want to get 5 keys  Is there any other way than doing  myDictionary get  firstKey   myDictionary get  secondKey   myDictionary get  thirdKey   myDictionary get  fourthKey   myDictionary get  fifthKey

User · Answer

If the fallback keys are not too many you can do something like this  value   my dict get  first key   or my dict get  second key

User · Answer

I think list comprehension is one of the cleanest ways that doesn t need any additional imports   gt  gt  gt  d   quot foo quot   1   quot bar quot   2   quot baz quot   3   gt  gt  gt  a    d get k  for k in   quot foo quot    quot bar quot    quot baz quot     gt  gt  gt  a  1  2  3   Of if you want the values as individual variables then use multiple-assignment   gt  gt  gt  a b c    d get k  for k in   quot foo quot    quot bar quot    quot baz quot     gt  gt  gt  a b c  1  2  3

User · Answer

You can use At from pydash   from pydash import at dict     a   1   b   2   c   3  list   at dict   a    b   list     1  2

User · Answer

Use a for loop   keys     firstKey    secondKey    thirdKey   for key in keys      myDictionary get key    or a list comprehension    myDictionary get key  for key in keys

User · Answer

There already exists a function for this   from operator import itemgetter  my dict    x  x  2 for x in range 10    itemgetter 1  3  2  5  my dict    gt  gt  gt   1  9  4  25    itemgetter will return a tuple if more than one argument is passed  To pass a list to itemgetter  use  itemgetter  wanted keys  my dict    Keep in mind that itemgetter does not wrap its output in a tuple when only one key is requested  and does not support zero keys being requested

User · Answer

As I see no similar answer here - it is worth pointing out that with the usage of a  list   generator  comprehension  you can unpack those multiple values and assign them to multiple variables in a single line of code   first val  second val    myDict get key  for key in  first key  second key

User · Answer

No-one has mentioned the map function  which allows a function to operate element-wise on a list   mydictionary     a    apple    b    bear    c    castle   keys     b    c    values   list  map mydictionary get  keys       values     bear    castle

User · Answer

If you have pandas installed you can turn it into a series with the keys as the index  So something like  import pandas as pd  s   pd Series my dict   s   key1    key3    key2

[python] Python dictionary get multiple values

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