f = lambda x: x * 2
is exactly the same thing as
def f(x):
return x * 2
Lambdas are usually used to create small, anonymous functions. Actually, they are just a syntatic sugar to define functions. The lambda expression above is exactly the same as your function, only without a name.
The main difference between lambda expressions and regular functions:
- Lambda表达式只能包含表达式，不能包含语句。表达式是任何可以放在=赋值右侧的。
# lambda function pass
logger.add(tmpfile.name, compression=lambda path: email(path, app_name=conf['app_name'], model_owner=conf['model_owner']))
# function call !!!
logger.add(tmpfile.name, compression=email(path, app_name=conf['app_name'], model_owner=conf['model_owner']))