The best way to structure the internal logic and control flow of a function

Best practices for functions include: keeping functions simple, using meaningful names, establishing single entry/exit points, using control flow structures, and handling exceptions. For example, the calculate_discount function efficiently calculates discounts, following the practices described above, including meaningful naming and exception handling for coupon codes.

Best practices for internal logical structure and control flow of functions

Function is a basic component of the program, and its internal structure and control flow play a very important role The degree determines the readability, maintainability and performance of the program. The following are best practices regarding the logical structure and control flow within a function:

Keep functions simple

• A function should be small enough that its logic can be understood in one go.
• Consider breaking large functions into smaller functions that perform specific tasks.

Use meaningful naming

• Choose descriptive names for functions and variables to clearly communicate their purpose.
• Avoid using ambiguous or generic names, such as foo or bar.

Single Entry Point and Single Exit Point

• Functions should have a clear entry and exit point.
• Avoid using goto statements or other forms of unstructured control flow.

Use control flow structures

• Use control flow structures (for example, if-else, switch-case, and loops) to control the execution flow of a function.
• Make sure the control flow structure is well-nested and does not cause code clutter.

Handling exceptions

• Anticipate exceptions that may be thrown in functions and handle them appropriately.
• Use try-catch blocks to catch exceptions and perform appropriate recovery operations.

Practical case

The following is an example of a function that follows best practices:

def calculate_discount(price, coupon_code):
  """计算给定价格和优惠券代码的折扣。"""

  discount = 0

  if coupon_code == "SAVE10":
    discount = 0.1
  elif coupon_code == "SAVE20":
    discount = 0.2
  elif coupon_code == "FREESHIP":
    discount = price * 0.1  # 为运费提供 10% 的折扣

  return price * discount

This function follows the following best practices:

• It is concise enough that its logic can be understood in one go.
• It uses meaningful names (calculate_discount and discount).
• It has a single entry and exit point.
• It uses the if-else structure to control the execution flow.
• It handles exceptions in case an invalid coupon code is passed.

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