Naming Rules
There are several rules for naming variables in Python. These are the following:
- A variable name must start with a letter or the underscore character, which means a variable name can not begin with a number.
 - A variable name may contain only English letters, numbers, and underscore characters.
 - Variables’ names are case sensitive, i.e., 
Chapter,chapter, andCHAPTERwill be considered three different objects by Python. 
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Seção 2. Capítulo 2
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Naming Rules
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There are several rules for naming variables in Python. These are the following:
- A variable name must start with a letter or the underscore character, which means a variable name can not begin with a number.
 - A variable name may contain only English letters, numbers, and underscore characters.
 - Variables’ names are case sensitive, i.e., 
Chapter,chapter, andCHAPTERwill be considered three different objects by Python. 
Tudo estava claro?
Obrigado pelo seu feedback!
Seção 2. Capítulo 2