流程控制
if elif else break continue
普通条件语句
s = input('birth: ')
birth = int(s)
if birth < 1990:
print('90前')
elif birth < 2000:
print('90后')
else :
print('00后')
print('-----------------------------------------------------------------')
三元运算
name = 'xiaoming' if 1 == 1 else 'xiaohong'
for in
names = ['Michael', 'Bob', 'Tracy'] #迭代list...里的元素
for name in names:
print(name)
sum = 0
for x in [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]:
sum = sum + x
print(sum)
sum = 0
for x in range(101):
sum = sum + x
print(sum)
while
>>> t = 0
>>> while t < 3:
print(t)
t += 1
0
1
2
break
n = 1
while n <= 100:
if n > 10: # 当n = 11时，条件满足，执行break语句
break # break语句会结束当前循环
print(n)
n = n + 1
print('END')
continue
n = 0
while n < 10:
n = n + 1
if n % 2 == 0: # 如果n是偶数，执行continue语句
continue # continue语句会直接继续下一轮循环，后续的print()语句不会执行
print(n)
enumrate
>>> li = [11,22,33]
>>> for k,v in enumerate(li, 1):
print(k, v)
1 11
2 22
3 33
