Python>循环

#-*- coding = utf-8 -*-
#@Time : 2020/6/16 20:52
#@Authur : Agur Zheng
#@File : loop_exercise.py
#@Software : PyCharm

# for循环,范围是包括起点不包括终点

# 从0~4依次打印
for i in range(2,5):
    print(i)

# 从0~11，以3为步进值打印
for i in range(0,11,3):
    print(i)

for i in range(4):  # 不指定起始值默认从0开始
    print(i)

for i in range(-10,-100,-20):
    print(i)

# 循环范围是字符串
name = "AgurZheng"
for x in name:
    print(x, end="\t")  #依次打印字符串name中的各个字符
print("")

#循环范围是列表,
#len()函数获取对象长度，本例中是获取列表长度
names = ["花花","洋洋","小米","小明"]
for i in range(len(names)):
    print(i, names[i], sep="-")

# while循环
i = 0
while i < 5:
    print("这是第%d次执行循环" % (i+1))
    print(i)
    i += 1

# 1~100求和
i = 1
reult = 0
while i < 100:  #依次输出i+，在result中记录加上i的结果
    print("%d + " % i,end="")
    reult += i
    i += 1
reult += 100
print("100 = %d" % reult)

# 直接打印结果的1~100求和
sum = 0
n = 100
counter = 1
while counter <= 100:   #while循环里的计数器需要在循环外定义好才能使用，for循环的计数器不用
    sum += counter
    counter += 1
print("1到100的和是", sum)

# while循环中else的使用

counter = 0
while counter < 5:
    print(counter, "小于5")
    counter += 1
else:
    print(counter, "等于或大于5")

'''
打印99乘法表，每行打印一个数字的所有乘法
flag_row表示行，flag_column表示列的计数器
'''
flag_row = 1
while flag_row <= 9:
    flag_column = 1
    while flag_column <= flag_row:
        product = flag_row * flag_column
        print("%d * %d = %d"%(flag_row,flag_column, product), end="\t")
        flag_column += 1
    else:
        print("")
    flag_row += 1

for row in range(1,10):
    for column in range(1,(row+1)):
        print("%d * %d = %d"%(row, column, (row*column)),end="\t")
    print("")