Not sure what you're after, but what's wrong with just setting them? Parent.avar = "a class var"
On November 7, 2018 7:48:40 AM MST, Albert-Jan Roskam <sjeik_ap...@hotmail.com> wrote: >Hi, > >Background: In my code I use sqlalchemy to read SQL server data. I want >to write that data to HDF5 using pytables (see 'declaring a column >descriptor': https://www.pytables.org/usersguide/tutorials.html). My >question is not about pytables or sqlalchemy per se, but I thought it >would be informative to mention this. > >What is the best way to dynamically set class variables? I am looking >for a generalization of something like this: > >class Parent: pass >class Child(Parent): > col1 = 'str' > col2 = 'int' > >Several (im)possible solutions: > ># ------- >class Parent: pass >class_vars = dict(col1='str', col2='int') > ># approach 1 >Child = type('Child', (Parent,), class_vars) > ># approach 2 >class Child(Parent): pass >Child.__dict__.update( class_vars ) # AttributeError: 'mappingproxy' >object has no attribute 'update' > ># approach 3 >class Child(Parent): pass >for k, v in class_vars.items(): > setattr(Child, k, v) > >I initially chose approach #1, but I find this way of defining a class >quite cryptic (but then, it's part of the language definition!). What's >the best way to do this? I am using Python 3.5 (Windows). Thanks in >advance! > >Best wishes, >Albert-Jan >_______________________________________________ >Tutor maillist - Tutor@python.org >To unsubscribe or change subscription options: >https://mail.python.org/mailman/listinfo/tutor -- Sent from my Android device with K-9 Mail. Please excuse my brevity. _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
