Question

I have constructed my own class User which has the property userID. I override the __repr__ so that it’s the userID string.

In another class I have an array self.users = [] with a couple User instances. For testing purposes I gave them user ID’s 1 and 2. I use:

'[%s]' % ','.join(map(str, self.users))

To print the contents of the array, producing:

[1,2]

I’m trying to make an if statement along the lines of:

if "1" in self.users:
  print "True"

Above is a simple representation of what I’m trying to achieve. I have tried many approaches and I can’t get the program to print true. Does anyone know how to do this?

Answer 1

Do you want:

if any("1" in str(x) for x in self.users):
   print "True"

---

probably better is:

if any("1" == x.userID for x in self.users):
   print True

if I’m reading your post correctly.

---

Finally, depending on the API for User, you could use the ID in an equality test:

class User(object):
    def __eq__(self,other):
       return self.userID == other
   #other methods here

Now you can use __contains__ (in) on your list as you were trying to do initially:

if "1" in self.users:
   print "True"