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The main problem is the repetetiveness and nestedness when it comes to reading user inputs and mapping them to the function calls. You are currently using multiple if/else branches, but, what if you would use a dictionary to map choices into function names:

COMMANDS = {
 '1': addition,
 '2': subtraction,
 '3': multiplication,
 '4': division,
 '5': exit,
 '6': main
}
if choice not in COMMANDS:
 print('I\'m sorry, I didn\'t understand your input.')
 basic_math()
else:
 COMMANDS[choice]()

Note that exit here is a function you might have to exit the app.

Also, look through the third-party apps in the CLI space - there might be a tool that can ease creating this kind of question-choice style programs.

Here are some other notes:

• the program is too long - split it into multiple logical parts to have a better separation of concern and modularity. For example, the calculations of areas and volumes should be separated from the question-choice handling functions

• you can use multi-line strings instead of having regular strings with newline characters

• you can wrap the string inside the print() statement around double quotes so that you won't need to escape the single quote (credit to @Dex'ter):

   "I'm sorry, I didn't understand your input."
  

The main problem is the repetetiveness and nestedness when it comes to reading user inputs and mapping them to the function calls. You are currently using multiple if/else branches, but, what if you would use a dictionary to map choices into function names:

COMMANDS = {
 '1': addition,
 '2': subtraction,
 '3': multiplication,
 '4': division,
 '5': exit,
 '6': main
}
if choice not in COMMANDS:
 print('I\'m sorry, I didn\'t understand your input.')
 basic_math()
else:
 COMMANDS[choice]()

Note that exit here is a function you might have to exit the app.

Also, look through the third-party apps in the CLI space - there might be a tool that can ease creating this kind of question-choice style programs.

Here are some other notes:

• the program is too long - split it into multiple logical parts to have a better separation of concern and modularity. For example, the calculations of areas and volumes should be separated from the question-choice handling functions

• you can use multi-line strings instead of having regular strings with newline characters

• you can wrap the string inside the print() statement around double quotes so that you won't need to escape the single quote (credit to @Dex'ter):

   "I'm sorry, I didn't understand your input."
  

The main problem is the repetetiveness and nestedness when it comes to reading user inputs and mapping them to the function calls. You are currently using multiple if/else branches, but, what if you would use a dictionary to map choices into function names:

COMMANDS = {
 '1': addition,
 '2': subtraction,
 '3': multiplication,
 '4': division,
 '5': exit,
 '6': main
}
if choice not in COMMANDS:
 print('I\'m sorry, I didn\'t understand your input.')
 basic_math()
else:
 COMMANDS[choice]()

Note that exit here is a function you might have to exit the app.

Also, look through the third-party apps in the CLI space - there might be a tool that can ease creating this kind of question-choice style programs.

Here are some other notes:

• the program is too long - split it into multiple logical parts to have a better separation of concern and modularity. For example, the calculations of areas and volumes should be separated from the question-choice handling functions
• you can use multi-line strings instead of having regular strings with newline characters

The main problem is the repetetiveness and nestedness when it comes to reading user inputs and mapping them to the function calls. You are currently using multiple if/else branches, but, what if you would use a dictionary to map choices into function names:

COMMANDS = {
 '1': addition,
 '2': subtraction,
 '3': multiplication,
 '4': division,
 '5': exit,
 '6': main
}
if choice not in COMMANDS:
 print('I\'m sorry, I didn\'t understand your input.')
 basic_math()
else:
 COMMANDS[choice]()

Note that exit here is a function you might have to exit the app.

Also, look through the third-party apps in the CLI space - there might be a tool that can ease creating this kind of question-choice style programs.

Here are some other notes:

• the program is too long - split it into multiple logical parts to have a better separation of concern and modularity. For example, the calculations of areas and volumes should be separated from the question-choice handling functions

• you can use multi-line strings instead of having regular strings with newline characters

• you can wrap the string inside the print() statement around double quotes so that you won't need to escape the single quote (credit to @Dex'ter):

   "I'm sorry, I didn't understand your input."
  

The main problem is the repetetiveness and nestedness when coming to reading user inputs and mapping them to the function calls. You are currently using multiple if/else branches, but, what if you would use a dictionary to map choices into function names:

COMMANDS = {
 '1': addition,
 '2': subtraction,
 '3': multiplication,
 '4': division,
 '5': exit,
 '6': main
}
if choice not in COMMANDS:
 print('I\'m sorry, I didn\'t understand your input.')
 basic_math()
else:
 COMMANDS[choice]()

Note that exit here is a function you might have to exit the app.

Also, look through the third-party apps in the CLI space - there might be a tool that can ease creating this kind of question-choice style programs.

Here are some other notes:

• the program is too long - split it into multiple logical parts to have a better separation of concern and modularity. For example, the calculations of areas and volumes should be separated from the question-choice handling functions
• you can use multi-line strings instead of having regular strings with newline characters

The main problem is the repetetiveness and nestedness when it comes to reading user inputs and mapping them to the function calls. You are currently using multiple if/else branches, but, what if you would use a dictionary to map choices into function names:

COMMANDS = {
 '1': addition,
 '2': subtraction,
 '3': multiplication,
 '4': division,
 '5': exit,
 '6': main
}
if choice not in COMMANDS:
 print('I\'m sorry, I didn\'t understand your input.')
 basic_math()
else:
 COMMANDS[choice]()

Note that exit here is a function you might have to exit the app.

Also, look through the third-party apps in the CLI space - there might be a tool that can ease creating this kind of question-choice style programs.

Here are some other notes:

• the program is too long - split it into multiple logical parts to have a better separation of concern and modularity. For example, the calculations of areas and volumes should be separated from the question-choice handling functions
• you can use multi-line strings instead of having regular strings with newline characters