题目：

给出一个变量，判断是否可以被遍历，至少用3种方法。

#python #iter #遍历数组

视频教程：

Python入门题038：判断是否可遍历（3种方法）

代码1：

def can_iter(v):
    try:
        iter(v)
        return True
    except:
        return False


print(can_iter(range(10)))
print(can_iter([1, 2]))
print(can_iter({'a': 1}))
print(can_iter('hello'))
print(can_iter(1))

代码2：

from collections.abc import Iterable


def can_iter(v):
    return isinstance(v, Iterable)


print(can_iter(range(10)))
print(can_iter([1, 2]))
print(can_iter({'a': 1}))
print(can_iter('hello'))
print(can_iter(1))

代码3：

def can_iter(v):
    try:
        for i in v:
            pass
        return True
    except:
        return False


print(can_iter(range(10)))
print(can_iter([1, 2]))
print(can_iter({'a': 1}))
print(can_iter('hello'))
print(can_iter(1))