Python标准库使用案例详解！

def dump(value):
    print(type(value), value)
dump(1)
dump(1.0)
dump("one")

def dump(function):
 if callable(function):
    print(function, "is callable")
 else:
    print(function, "is *not* callable")
class A:
    def method(self, value):
        return value
class B(A):
    def __call__(self, value):
        return value

a = A()
b = B()
dump(0) # simple objects
dump("string")
dump(callable)
dump(dump) # function
dump(A) # classes
dump(B)
dump(B.method)
dump(a) # instances
dump(b)
dump(b.method)

def dump(expression):
 result = eval(expression)
 print(expression, "=>", result, type(result))
dump("1")
dump("1.0")
dump("'string'")
dump("1.0 + 2.0")
dump("'*' * 10")
dump("len('world')")