第五章：循环

1.while循环

# 初始条件
n = 0
while n < 5:print("hello python")n +=1# 高斯求和
n  = 1
result = 0;
while n < 101:result = result + nn+=1print(result)

2.for 循环

# for
for i in range (5):print("abc")# range的意思
print(range(10))
print(list(range(10)))# 高斯求和
res = 0
for i in range(101):res += iprint(res)# 1! + 2! + 3!
result2 = 0
for n in range(5):if n>0 :r = 1for i in range(n +1):if i>0:r *= iprint(r)result2+=r
print(result2)

3.break

while True:name = input("请输入你的名字：")if name == "abc":print("nihao ")breakelse:print("请重试")

print(range(2,5))
print(list(range(2,5)))

4.continue

# 九九乘法表
for i in range (9):for j in range(i+1):print('%dx%d=%d' %(j+1, i+1, (j+1) * (i+1)), end=' ')print()