for ... in ...
//?for?...?in?字符串for?i?in?'abc':
print(i)
'''
a
b
c
'''
//?for?...?in?數組
for?i?in?['a',?'b',?'c']:
print(i)
'''
a
b
c
'''
//?for?...?in?元組
for?i?in?('a',?'b',?'c'):
print(i)
'''
a
b
c
'''
//?for?...?in?字典(得到的是字典的key)
for?k?in?{'學號':30,'姓名':'小明'}:
print(k)
'''
姓名
學號
'''
//?for?...?in?字典.items()(得到的是字典的key,?value)
for?k,?v?in?{'學號':30,'姓名':'小明'}.items():
print(k,?v)
'''
姓名?小明
學號?30
'''
for ... in range(...)
//?for?...?in?range(num)for?i?in?range(3):
print(i)
'''
0
1
2
'''
//?for?...?in?range(num1,?num2)
for?i?in?range(1,?3):
print(i)
'''
1
2
'''
//?for?...?in?range(num1,?num2,?num3)
for?i?in?range(3,?1,?-1):
print(i)
'''
3
2
'''
for?i?in?range(1,?5,?2):
print(i)
'''
1
3
'''
倒敘
for?i?in?reversed([1,2,3,4]):print(i)
’‘’
4
3
2
1
‘’‘
又想得到遍歷次數，又想得到數組值
for i,e in enumerate(array):
for?i,e?in?enumerate(['21dw',?55,?22,?'rw']):print(i,?e)
'''
0?21dw
1?55
2?22
3?rw
'''
列表生成式
[...for ... in array]]
print([x?*?x?for?x?in?[2,?34,?324,?43]])'''
[4,?1156,?104976,?1849]
'''
//相當於
list?=?[]
for?x?in?[2,?34,?324,?43]:
list.append(x?*?x)
print(list)