pass,break,continue的使用场景

# ### 关键字的使用 pass / break / continue

# pass 过 起到占位的作用
if 5 == 5:
    pass
    print(123)

# break 只能应用在循环当中 用于终止当前循环
# 打印1~10 遇到5终止循环
i =  1
while i <= 10:
    if i == 5:
        break
    print(i)
    i += 1

# 打印三行两列数字
i = 1
while i <=3:
    j = 1
    while j <=3:
        if j ==2:
            break
        print(i,j)
        j += 1
    i += 1

# continue 跳过当前循环,从下一次循环开始
# 打印1~10 不打印5
i = 1
while i <=10:
    if i == 5:
        i += 1
        continue
    print(i)
    i += 1

# 打印所有1~100 不含有4的数
# 方法一
i = 1
while i <= 100:
    if "" in str(i):
        i += 1
        continue
    print(i)
    i += 1

# 方法二
print("<=====>")
i = 1
while i <= 100:
    if i // 10 == 4 or i % 10 == 4:
        i += 1
        continue
    print(i)
    i += 1