When i used input as a variable name, there is no error provided. After that I am calling input() function to read data. In such case, below error is reported.

Python 3.6.3 (v3.6.3:2c5fed8, Oct  3 2017, 17:26:49) [MSC v.1900 32 bit (Intel)] on win32
Type "copyright", "credits" or "license()" for more information.
>>> input = "Test input"
>>> data = input("Please enter some input")
Traceback (most recent call last):
  File "<pyshell#1>", line 1, in <module>
    data = input("Please enter some input")
TypeError: 'str' object is not callable
>>>

While "shadowing a builtin" was irritating in your case, it is an unavoidable part of how Python works and is in some cases considered a feature.  

FWIW, there is a workaround.  You can reference the real input() function directly in the __builtins__ namespace:

    >>> input = 'x'
    >>> __builtins__.input('Enter your name: ')
    Enter your name: Becky
    'Becky'
    >>> input
    'x'

Also, consider using tools like pylint and flake8 which give warnings in cases like this.