python中for in的用法详解

for x in y:
    循环体

s = 'I love you more than i can say'
for i in s:
  print(i)

l = ['鹅鹅鹅', '曲项向天歌', '锄禾日当午', '春种一粒粟']
for i in l:
  print(i)
# 可以获取下表，enumerate每次循环可以得到下表及元素
for i, v in enumerate(l):
  print(i, v)

d = {'a':'apple', 'b':'banana', 'c':'car', 'd': 'desk'}
for key in d:
  # 遍历字典时遍历的是键
  print(key, d.get(key))
# for key, value in d.items():
# 上下两种方式等价 d.items() <=> dict.items(d)
for key, value in dict.items(d):
  print(key, value)

print(range(10))
# 可以生成从0开始到10的连续整数的迭代对象
print(range(0, 10))
# 可以遍历
for i in range(10):
  print(i)
# 强制转换为列表
print(list(range(1, 11)))

# 列表生成式
print([i for i in range(1, 11)])
print([i*2 for i in range(1, 11)])
print([i*i for i in range(1, 11)])
print([str(i) for i in range(1, 11)])
print([i for i in range(1, 11) if i % 2 == 0])