如果条件评估为真，如何避免在 IF 检查和返回语句中重复函数调用？

Question

I have a function process . If attempts to retrieve one of name, address, phone from the input data (in that order) using their own functions which either return the appropriate value or return ''. If all return '' then return the data as it is.

Following is the code, is there a better way to avoid duplicating function invocations in both if check and return?

def process(data):
  if get_name(data):
    return get_name(data)
  elif get_address(data):
    return get_address(data)
  elif get_phone(data):
    return get_phone(data)
  return data

Answer 1

As per your code logic, you can write it like this. The or sequence will return the first positive data, in other words the data that is truthy .

def process(data):
    name = get_name(data)
    address = get_address(data)
    phone = get_phone(data):
    return name or address or phone or data

Answer 2

You can use walrus operator := if you use python 3.8+

def process(data):
  if name:=get_name(data):
    return name
  elif address := get_address(data):
    return address
  elif phone := get_phone(data):
    return phone
  return data