How to print a dictionary s key

Question

I would like to print a specific Python dictionary key   mydic      mydic  key name      value name    Now I can check if mydic has key  key name    but what I would like to do is print the name of the key  key name   Of course I could use mydic items    but I don t want all the keys listed  merely one specific key  For instance I d expect something like this  in pseudo-code    print  the key name is   mydic  key name   name the key     and its value is   mydic  key name     Is there any name the key   method to print a key name     Edit  OK  thanks a lot guys for your reactions     I realise my question is not well formulated and trivial  I just got confused because i realised key name and mydic  key name   are two different things and i thought it would incorrect to print the key name out of the dictionary context  But indeed i can simply use the  key name  to refer to the key

User · Answer

To access the data  you ll need to do this   foo          foo0    bar0        foo1    bar1        foo2    bar2        foo3    bar3    for bar in foo    print bar    Or  to access the value you just call it from the key  foo bar

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Probably the quickest way to retrieve only the key name   mydic      mydic  key name      value name   print mydic items   0  0    Result    key name   Converts the dictionary into a list then it lists the first element which is the whole dict then it lists the first value of that element which is  key name

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A dictionary has  by definition  an arbitrary number of keys  There is no  the key   You have the keys   method  which gives you a python list of all the keys  and you have the iteritems   method  which returns key-value pairs  so  for key  value in mydic iteritems         print key  value   Python 3 version   for key  value in mydic items         print  key  value    So you have a handle on the keys  but they only really mean sense if coupled to a value  I hope I have understood your question

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In Python 3     A simple dictionary x     X   yes    Y   no    Z   ok      To print a specific key  for example key at index 1  print  key for key in x keys    1      To print a specific value  for example value at index 1  print  value for value in x values    1      To print a pair of a key with its value  for example pair at index 2  print   key for key in x keys    2    value for value in x values    2       To print a key and a different value  for example key at index 0 and value at index 1  print   key for key in x keys    0    value for value in x values    1       To print all keys and values concatenated together print    join str key         str value  for key  value in x items        To print all keys and values separated by commas print      join str key           str value  for key  value in x items        To print all pairs of  key  value  one at a time for e in range len x        print   key for key in x keys    e    value for value in x values    e       To print all pairs  key  value  in a tuple print tuple   key for key in x keys    i    value for value in x values    i   for i in range len x

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dict     name     Fred    age    100   employed    True      Choose key to print  could be a user input  x    name   if x in dict keys        print x

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dic     key 1   value 1   key b   value b     print the keys  for key in dic      print key   print the values  for value in dic itervalues        print value   print key and values for key  value in dic iteritems        print key  value   Note In Python 3  dic iteritems   was renamed as dic items

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highlighting how to use a named variable within a string  mapping     a   1   b   2     simple method  print f a   mapping  a      print f b   mapping  b         programmatic method  for key  value in mapping items        print f  key    value       yields    a 1   b 2    using list comprehension print   n  join f  key    value   for key  value in dict items         yields    a  1   b  2   Edit  Updated for python 3 s f-strings

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I m adding this answer as one of the other answers here  https   stackoverflow com a 5905752 1904943  is dated  Python 2  iteritems   and the code presented -- if updated for Python 3 per the suggested workaround in a comment to that answer -- silently fails to return all relevant data     Background  I have some metabolic data  represented in a graph  nodes  edges         In a dictionary representation of those data  keys are of the form  604  1037  0   representing source and target nodes  and the edge type   with values of the form 5 3 1 9  representing EC enzyme codes    Find keys for given values  The following code correctly finds my keys  given values   def k4v edited my dict  value       values list          for k  v in my dict items            if v    value              values list append k      return values list  print k4v edited edge attributes   5 3 1 9         604  1037  0    604  3936  0    1037  3936  0     whereas this code returns only the first  of possibly several matching  keys   def k4v my dict  value       for k  v in my dict items            if v    value              return k  print k4v edge attributes   5 3 1 9        604  1037  0     The latter code  naively updated replacing iteritems with items  fails to return  604  3936  0    1037  3936  0

User · Answer

What s wrong with using  key name  instead  even if it is a variable

User · Answer

The name of the key  key name  is key name  therefore print  key name  or whatever variable you have representing it

User · Answer

Make sure to do   dictionary keys     rather than dictionary keys

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Or you can do it that manner   for key in my dict       print key  my dict key

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If you want to get the key of a single value  the following would help   def get key b     the value is passed to the function     for k  v in mydic items            if v lower      b lower                return k   In pythonic way   c   next  x for x  y in mydic items   if y lower      b lower             Enter a valid  Value    print c

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key name         print  the key name is  s and its value is  s   key name  mydic key name

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Additionally you can use      print dictionary items     prints keys and values print dictionary keys     prints keys print dictionary values     prints values

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import pprint pprint pprint mydic keys

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Since we re all trying to guess what  print a key name  might mean  I ll take a stab at it   Perhaps you want a function that takes a value from the dictionary and finds the corresponding key   A reverse lookup   def key for value d  value          Return a key in  d  having a value of  value          for k  v in d iteritems            if v    value              return k   Note that many keys could have the same value  so this function will return some key having the value  perhaps not the one you intended   If you need to do this frequently  it would make sense to construct the reverse dictionary   d rev   dict v k for k v in d iteritems

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Hmm  I think that what you might be wanting to do is print all the keys in the dictionary and their respective values   If so you want the following   for key in mydic    print  the key name is    key    and its value is    mydic key    Make sure you use   s instead of    as well  The comma will put each of those items on a separate line I think  where as plus will put them on the same line

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Try this   def name the key dict  key       return key  dict key   mydict     key1  1   key2  2   key3  3   key name  value   name the key mydict   key2   print  KEY NAME   s    key name print  KEY VALUE   s    value

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I looked up this question  because I wanted to know how to retrieve the name of  the key  if my dictionary only had one entry  In my case  the key was unknown to me and could be any number of things  Here is what I came up with   dict1     random word    1 2 3   key name   str  key for key in dict1   strip                 print key name     equal to  random word   type  string

[python] How to print a dictionary's key?

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