How to search if dictionary value contains certain string with Python

Question

I have a dictionary with key-value pair  My value contains strings  How can I search if a specific string exists in the dictionary and return the key that correspond to the key that contains the value   Let s say I want to search if the string  Mary  exists in the dictionary value and get the key that contains it  This is what I tried but obviously it doesn t work that way    Just an example how the dictionary may look like myDict     age     12     address     34 Main Street  212 First Avenue               firstName     Alan    Mary-Ann     lastName     Stone    Lee      Checking if string  Mary  exists in dictionary value print  Mary  in myDict values     Is there a better way to do this since I may want to look for a substring of the value stored   Mary  is a substring of the value  Mary-Ann

User · Answer

def search myDict  lookup       a        for key  value in myDict items            for v in value              if lookup in v                   a append key      a list set a       return a   if the research involves more keys maybe you should create a list with all the keys

User · Answer

For me  this also worked   def search myDict  search1       search a        for key  value in myDict items            if search1 in value              search a append key   search myDict   anyName   print search a     search a makes the list a globally available if a match of the substring is found in any value  the key of that value will be appended to a

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gt  gt  gt  myDict   lastName     Stone    Lee     age     12     firstName     Alan    Mary-Ann      address     34 Main Street  212 First Avenue      gt  gt  gt  Set   set     gt  gt  gt  not     for Key  Values in myDict items   for Value in Values if  Mary  in Value and Set add Key   and list Set    firstName

User · Answer

You can do it like this    Just an example how the dictionary may look like myDict     age     12     address     34 Main Street  212 First Avenue           firstName     Alan    Mary-Ann     lastName     Stone    Lee     def search values  searchFor       for k in values          for v in values k               if searchFor in v                  return k     return None   Checking if string  Mary  exists in dictionary value print search myDict   Mary    prints firstName

User · Answer

I am a bit late  but another way is to use list comprehension and the any function  that takes an iterable and returns True whenever one element is True     Checking if string  Mary  exists in the lists of the dictionary values print any any  Mary  in s for s in subList  for subList in myDict values     If you wanna count the number of element that have  quot Mary quot  in them  you can use sum      Number of sublists containing  Mary  print sum any  Mary  in s for s in subList  for subList in myDict values       Number of strings containing  Mary  print sum sum  Mary  in s for s in subList  for subList in myDict values     From these methods  we can easily make functions to check which are the keys or values matching  To get the keys containing  Mary   def matchingKeys dictionary  searchString       return  key for key val in dictionary items   if any searchString in s for s in val    To get the sublists  def matchingValues dictionary  searchString       return  val for val in dictionary values   if any searchString in s for s in val    To get the strings  def matchingValues dictionary  searchString       return  s for s i for val in dictionary values   if any searchString in s for s in val    To get both  def matchingElements dictionary  searchString       return  key val for key val in dictionary items   if any searchString in s for s in val    And if you want to get only the strings containing  quot Mary quot   you can do a double list comprehension   def matchingStrings dictionary  searchString       return  s for val in dictionary values   for s in val if searchString in s

User · Answer

import re for i in range len myDict values           for j in range len myDict values   i                  match re search r Mary   myDict values   i  j                if match                       print match group    Mary                      print myDict keys   i   firstName                      print myDict values   i  j   Mary-Ann

User · Answer

Following is one liner for accepted answer      for one line lovers      def search dict my dict searchFor       s val      k if searchFor in v else None for v in my dict k   for k in my dict          return s val

User · Answer

import re for i in range len myDict values          for j in range len myDict values   i              match re search r Mary   myDict values   i  j            if match                   print match group    Mary                  print myDict keys   i   firstName                  print myDict values   i  j   Mary-Ann

User · Answer

Klaus solution has less overhead  on the other hand this one may be more readable  myDict     age     12     address     34 Main Street  212 First Avenue               firstName     Alan    Mary-Ann     lastName     Stone    Lee     def search myDict  lookup       for key  value in myDict items            for v in value              if lookup in v                  return key  search myDict   Mary

User · Answer

import json  mtach  in json dumps myDict  is true if found

[python] How to search if dictionary value contains certain string with Python

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