3. 条件语句使用规范

score = int(input("请输入一个分数:"))
if 100 >= score >= 90:
    print("A")
elif score >= 80:
    print("B")
elif score >= 60:
    print("C")
elif score >= 0:
    print("D")
else:
    print("输入错误")


分数查询语句优化

score = int(input("请输入一个分数:"))
if 100 >= score >= 90:
    print("A")
else:
    if score >= 80:
        print("B")
    else:
        if score >= 60:
            print("C")
        else:
            if score >= 0:
                print("D")
            else:
                print("输入错误")

for语句用法规范

print("计算1+2+3+...=")
result = 0
for i in range(101):
#range(start,end,step)只有一个数字两个数字三个数字依次增加
    result += i
    print(result)

for i in range(0,10,2):
    print("I Love FishC")
for i in range(0,10,2):
    print("i")
#此时i表示什么含义？

next 遍历编辑器

number = (i for i in range(3))
print(number.__next__())
print(number.__next__())
print(number.__next__())
number = tuple(number)
print("转化后的：",number)