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Python 3: An interactive deep dive

Everything is Case-Sensitive

Explore how Python treats all names as case-sensitive including variables, functions, and classes. Understand the importance of precise casing when defining or using names to avoid errors in your first Python program.

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All names in Python are case-sensitive: variable names, function names, class names, module names, exception names. If you can get it, set it, call it, construct it, import it, or raise it, it’s case-sensitive.

Python 3.5
an_integer = 1
print (an_integer)
#1
Python 3.5
AN_INTEGER
#Traceback (most recent call last):
# File "/usercode/__ed_file.py", line 1, in <module>
# AN_INTEGER
#NameError: name 'AN_INTEGER' is not defined
Python 3.5
An_Integer
#Traceback (most recent call last):
# File "/usercode/__ed_file.py", line 1, in <module>
# An_Integer
#NameError: name 'An_Integer' is not defined
Python 3.5
an_inteGer
#Traceback (most recent call last):
# File "/usercode/__ed_file.py", line 1, in <module>
# an_inteGer
#NameError: name 'an_inteGer' is not defined