refactoring a python data validation interactive shell

refactoring is the process of restructuring existing computer code without changing its external behavior. it’s a critical practice for maintaining code quality and ensuring that your code is clean, efficient, and easy to understand. in this tutorial, we’ll look at how to refactor a simple python data validation interactive shell.

goals of refactoring

1. **improve readability**: make the code easier to read and understand.
2. **enhance maintainability**: make it easier to modify the code in the future.
3. **reduce duplication**: eliminate repetitive code.
4. **encapsulate functionality**: group related functionality.

example: initial version of a data validation interactive shell

let’s start with a simple interactive shell that validates a user's input. the initial version might look like this:

```python
def validate_age(input_age):
age = int(input_age)
if 0 = age = 120:
return true
else:
return false
return false

def validate_email(input_email):
if "@" in input_email and "." in input_email:
return true
return false

def main():
while true:
user_input = input("enter 'age' to validate age or 'email' to validate email (or 'quit' to exit): ")

if user_input == 'quit':
break

if user_input == 'age':
age_input = input("enter your age: ")
if validate_age(age_input):
print("valid age.")
else:
print("invalid age.")

elif user_input == 'email':
email_input = input("enter your email: ")
if validate_email(email_input):
print("valid email.")
else:
print("invalid email.")
else:
print("unknown command. please try again.")

if __name__ == "__main__":
main()
```

refactoring steps

1. **encapsulate validation logic**: create a generic validation fun ...

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refactoring
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