How to convert string values from a dictionary into int float datatypes

Question

I have a list of dictionaries as follows   list        a   1     b   2     c   3        d   4     e   5     f   6        How do I convert the values of each dictionary inside the list to int float   So it becomes   list        a  1    b  2    c  3       d  4    e  5    f  6       Thanks

User · Answer

newlist                           make an empty list   for i in list                      loop to hv a dict in list        s                               make an empty dict to store new dict data       for k in i keys                 to get keys in the dict of the list           s k  int i k            change the values from string to int by int func      newlist append s                to add the new dict with integer to the list

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For python 3        for d in list          d update  k  float v   for k  v in d items

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To handle the possibility of int  float  and empty string values  I d use a combination of a list comprehension  dictionary comprehension  along with conditional expressions  as shown   dicts      a    1     b         c    3 14159               d    4     e    5     f    6     print   k  int v  if v and     not in v else float v  if v else None             for k  v in d iteritems                   for d in dicts        a   1   c   3 14159   b   None     e   5   d   4   f   6     However dictionary comprehensions weren t added to Python 2 until version 2 7  It can still be done in earlier versions as a single expression  but has to be written using the dict constructor like the following     for pre-Python 2 7  print  dict  k  int v  if v and     not in v else float v  if v else None              for k  v in d iteritems                    for d in dicts        a   1   c   3 14159   b   None     e   5   d   4   f   6     Note that either way this creates a new dictionary of lists  instead of modifying the original one in-place  which would need to be done differently

User · Answer

Gotta love list comprehensions    dict  a  int x   for a  x in b items    for b in list     remark  for Python 2 only code you may use  iteritems  instead of  items

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for sub in the list      for key in sub          sub key    int sub key     Gives it a casting as an int instead of as a string

User · Answer

If that s your exact format  you can go through the list and modify the dictionaries   for item in list of dicts      for key  value in item iteritems            try              item key    int value          except ValueError              item key    float value    If you ve got something more general  then you ll have to do some kind of recursive update on the dictionary  Check if the element is a dictionary  if it is  use the recursive update  If it s able to be converted into a float or int  convert it and modify the value in the dictionary  There s no built-in function for this and it can be quite ugly  and non-pythonic since it usually requires calling isinstance

User · Answer

If you d decide for a solution acting  in place  you could take a look at this one    gt  gt  gt  d        a   1     b   2     c   3        d   4     e   5     f   6       gt  gt  gt   dt update  k  int v    for dt in d for k  v in dt iteritems     None  None  None  None  None  None   gt  gt  gt  d    a   1   c   3   b   2     e   5   d   4   f   6     Btw  key order is not preserved because that s the way standard dictionaries work  ie without the concept of order

[python] How to convert string values from a dictionary, into int/float datatypes?

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