TypeError str object is not callable-Solved

#python tutorial: TypeError str object is not callable
In this video i have shared how to solve TypeError str object is not callable
solution for this error is change variable name, this error comes as str variable is clashing with str() in built fuction.
here is exact code i used for this video
#TypeError: 'str' object is not callable

number=10
str1= "any string goes here"
str()
print(str(number))
print(str)

#str() #notcallable .
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.

[svbsbsndndbe]

a = "this is strings"
Print(len(a))
It shows
Type error : 'str' is not callable

[carlojamessaladaga]

classNames = f.read()('\n') typeerror: 'str' object is not callable

How can i fix this