Python中的迭代

迭代器种类

1. enumerate()
2. items()
3. np.nditer()
4. iterrows()

不同迭代器之间的区别：

使用迭代器的实例

enumerate()

# Input:
l = [‘a‘, ‘b‘, ‘c‘]
for index, item in enumerate(l):
    print(index, ‘:‘, item)

# Output:
0 : a
1 : b
2 : c

items()

# Input:
dict = {‘name:‘: ‘xiaoming‘, ‘grade‘: ‘59‘}
for key, item in dict.items():
    print(key, ‘:‘, item)

# Output:
name: : xiaoming
grade : 59

np.nditer()

# Input:
a = np.array([[1, 2], [4, 5]])
it = np.nditer(a1, flags=[‘multi_index‘], op_flags=[‘readwrite‘])
while not it.finished:
    ix = it.multi_index
    a[ix] += 100
    it.iternext()

# Output:
a
array([[101, 102],
       [104, 105]])

Python中的迭代（Iteration）

原文：https://www.cnblogs.com/musicalife/p/14725627.html