python for循环

str1 ="hello"
# 根据字符串的数量来进行遍历
for i in str1:
    print(i)

# 循环计数
str1 = "hello itcats"
sum = 0
for i in str1:
    sum += 1     #sum的值就是for循环了几次

print(sum)

for a in range(0, 10):
    print(a)

for i in range(0, 5):
    for b in range(0, 5):
        print("*",end="")
    print()

# for 计算指定范围偶数累加和

sum = 0
for i in range(50, 125,2):
    sum += i
print(sum)