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That's because the class has not been defined yet at this point. TL;DR. input function in Python 2.7, evaluates whatever your enter, as a Python expression. If you simply want to read strings, then use raw_input function in Python 2.7, which will not evaluate the read strings.. class Tree: def __init__(self, left: 'Tree', right: 'Tree'): self.left = left self.right = right. Python Ping Script: Ping a list of hosts/servers from a file in python ? Traceback (most recent call last): File "python", line 2, in
I am trying to construct a program on Python. You might have Class as a variable in global namespace, but inside your identify function local namespace, Class is not present. python documentation: NameError: name '???' Solved: NameError: name '_name_' is not defined in docker python program; String and integer comparison in Python; Tuples in python; Using for loop in python to test ping response from multiple hosts; Verify version of python installed on Linux system This is a piece of the program where the problem is. ... Python source files are interpreted top to bottom by the interpreter. Example. share. user defined date class user defined date class Develop a user defined date class with public.Fill the members using existing class method.implement the methods for finding current date(),days between method,advanced days and after days The workaround is using so called Forward Reference, i.e. If you are using Python 3.x, raw_input has been renamed to input.Quoting the Python 3.0 release notes,. You will get this if you are running the commands from the python shell: >>> __file__ Traceback (most recent call last): File "
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