How do i access a class through input

How do i access a class through input

I put together a small test code just to demonstrate the error I am getting when trying to enter a class with input. Nothing pretty or good its just to get the specific error across.

Code:

class people(object):      def deposit():          print("depositing")      def withdraw():          print("withdrawing")  John = people()  selection = input("Type John: ")  selection.deposit  

Error:

[evaluate classes.py]  Type John: John  Traceback (most recent call last):    File "c:\Users\Peter\Desktop\Desktop 2\Python\classes.py", line 9, in module      selection.deposit  builtins.AttributeError: 'str' object has no attribute 'deposit'  

Answer by CrakC for How do i access a class through input

input("Type John: ") returns a string, not an object of type people so you can't call the method deposit on it.

Workaround-

class people(object):      def deposit(self):          print("depositing")      def withdraw(self):          print("withdrawing")  selection = input("Type people(): ")  selection.deposit()  

Input-

people()    

Output-

depositing  

Answer by tuxtimo for How do i access a class through input

If it's only for demonstration purposes you could lookup the selection value in the locals() dict:

In [4]: John = 1    In [5]: selection = "John"    In [6]: locals()[selection]  Out[6]: 1  

So, your code would look like:

class people(object):      def deposit(self):          print("depositing")      def withdraw(self):          print("withdrawing")  John = people()  selection = input("Type John: ")  locals()[selection].deposit()  

However, please do not use this approach in production code. There are better patterns for dispatching stuff to objects..

Answer by user2357112 for How do i access a class through input

Generally, you don't want this kind of direct correspondence between user input and your internal variable names. You'd have some data structure to keep track of your people instances, perhaps a dict:

known_people = {'John': people(), 'Jake': people(), 'Jeffrey', people()}  

and you'd process user input to determine what to do with your data:

selected_person = known_people[selection]  selected_person.deposit()  

While you technically can access variables dynamically:

John = people()  selected_person = locals()[selection]  

you really, really shouldn't. It doesn't scale well to more complex data, and it introduces potential for lots of nasty bugs.

Answer by user5416120 for How do i access a class through input

<<<<<<answer is here<<>>and here>>>>>>

Answer by Igor Hatarist for How do i access a class through input

You could store the people (like John) in a separate object (like a dictionary).

Consider that approach:

class Man(object):      # I renamed the `people` class to `Man` since it's representing a single man (like John).      # You also have to add a required `self` parameter for every function inside of the class!      def deposit(self):          print("depositing")        def withdraw(self):          print("withdrawing")    # We'll make `people` a dictionary instead.  people = {      'John': Man()  }    selection = raw_input("Type John: ")    # You have to put parentheses there so the `deposit()` function would call  people[selection].deposit()  

eval() is pretty evil, so as locals().

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