dict object has no attribute has key

Question

While traversing a graph in Python  a I m receiving this error       dict  object has no attribute  has key    Here is my code   def find path graph  start  end  path          path   path    start      if start    end          return path     if not graph has key start           return None     for node in graph start           if node not in path              newpath   find path graph  node  end  path              if newpath  return newpath     return None   The code aims to find the paths from one node to others  Code source  http   cs mwsu edu  terry courses 4883 lectures graphs html  Why am I getting this error and how can I fix it

User · Answer

has key has been deprecated in Python 3 0  Alternatively you can use  in    graph   A    B   C        B    C   D     print  A  in graph   gt  gt  True  print  E  in graph   gt  gt  False

User · Answer

I think it is considered  more pythonic  to just use in when determining if a key already exists  as in  if start not in graph      return None

User · Answer

Try  if start not in graph   For more info see ProgrammerSought

User · Answer

has key was removed in Python 3  From the documentation         Removed dict has key       use the in operator instead       Here s an example   if start not in graph      return None

User · Answer

In python3  has key key  is replaced by   contains   key   Tested in python3 7   a     a  1   b  2   c  3  print a   contains    a

User · Answer

The whole code in the document will be    graph     A     B    C                  B     C    D                  C     D                  D     C                  E     F                  F     C    def find path graph  start  end  path              path   path    start          if start    end              return path         if start not in graph              return None         for node in graph start               if node not in path                  newpath   find path graph  node  end  path                  if newpath  return newpath         return None   After writing it  save the document and press F 5   After that  the code you will run in the Python IDLE shell will be   find path graph   A   D    The answer you should receive in IDLE is     A    B    C    D

[python] 'dict' object has no attribute 'has_key'

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