Changing variable names with Python for loops

Question

I was just wondering if anyone knew of a way to change variable names based off of a for loop for something like this   for i in range 3       group i self getGroup selected  header i    so that the names of the variables change to accomodate the data   Thanks    Sam

User · Answer

It looks like you want to use a list instead   group    for i in range 3        group i  self getGroup selected  header i

User · Answer

You probably want a dict instead of separate variables   For example  d      for i in range 3       d  group    str i     self getGroup selected  header i    If you insist on actually modifying local variables  you could use the locals function   for i in range 3       locals    group  str i     self getGroup selected  header i    On the other hand  if what you actually want is to modify instance variables of the class you re in  then you can use the setattr function  for i in group 3       setattr self   group  str i   self getGroup selected  header i    And of course  I m assuming with all of these examples that you don t just want a list   groups    self getGroup i header i  for i in range 3

User · Answer

You could access your class s   dict   attribute   for i in range 3       self   dict    group d    i  self getGroup selected  header i    But why can t you just use an array named group

User · Answer

Use a list   groups    0  3 for i in xrange 3       groups i    self getGroup selected  header   i    or more  Pythonically    groups    self getGroup selected  header   i  for i in xrange 3     For what it s worth  you could try to create variables the  wrong  way  i e  by modifying the dictionary which holds their values   l   locals   for i in xrange 3       l  group    str i     self getGroup selected  header   i    but that s really bad form  and possibly not even guaranteed to work

User · Answer

Definitely should use a dict using the   group    str i  key as described in the accepted solution but I wanted to share a solution using exec  Its a way to parse strings into commands  amp  execute them dynamically  It would allow to create these scalar variable names as per your requirement instead of using a dict  This might help in regards what not to do  and just because you can doesn t mean you should  Its a good solution only if using scalar variables is a hard requirement   l   locals   for i in xrange 3       exec  group    str i       self getGroup selected  header   i      Another example where this could work using a Django model example  The exec alternative solution is commented out and the better way of handling such a case using the dict attribute makes more sense   Class A models Model                  def   getitem   self  item      a   getitem    id            exec  attrb   self     item           return attrb         return self   dict   item    It might make more sense to extend from a dictionary in the first place to get setattr and getattr functions   A situation which involves parsing  for example generating  amp  executing python commands  dynamically  exec is what you want    More on exec here

[python] Changing variable names with Python for loops

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