Python "with"Lambda 函数中的关键字

Question

Python的with关键字在lambda函数中是如何表达的？请考虑以下事项:

def cat (filename):
    with open(filename, 'r') as f:
        return f.read()

lambda 实现的失败尝试:

cat = lambda filename: with open(filename, 'r') as f: return f.read()

Answer 1

lambda_form ::= "lambda" [parameter_list]: expression

不能，with 是语句，lambda 只返回表达式。