002-pythn基础-循环、编码

# 死循环
count = 1
while count <= 5:
    print("喷死你..")
    count = count + 1

# 数数  1-100
count = 1
while count < 101:
    print(count)
    count = count + 2

# 让用户一直去输入内容, 并打印. 直到用户输入q的时候退出程序
while True:
    content = input("请输入一句话,(输入q退出程序):")
    if content == ‘q‘:
        break   # 打断. 终止当前本层循环
    print(content)
 flag = True
while flag:
    content = input("请输入一句话,(输入q退出程序):")
    if content == ‘q‘:
        flag = False   # 打断. 终止当前本层循环
    print(content)
else:
    print("123")


while True:
    content = input("请输入一句话,(输入q退出程序):")
    if content == ‘q‘:
        continue   # 停止当前本次循环. 继续执行下一次循环
    print(content)
# break和continue的区别: break是彻底的停止掉当前层循环. continue停止当前本次循环,继续执行下一次循环



count = 1
while count <= 10:
   if count == 4:
       count = count + 1
       continue # 用来排除一些内容
   print(count)
   count = count + 1
# 必须要写

count = 1
while count <= 20:
   if count == 10:
       break # 不会触发else的执行,  while...else...是一个整体. break的时候彻底的停止这个整体
   print(count)
   count = count + 1
else:   # 当上面的条件不成立的时候执行这个else中的代码
   print("数完了")

name="alex"
age = 38
hobby = "浪"
location = "湖边"
print(age+"岁的"+name+"在"+location+"喜欢"+hobby) #
# 格式化
# %s 占位. 占位的是字符串, 全能的. 什么都能接
# %d 占位. 占位的是数字
print("%s岁的%s在%s喜欢%s" % (age, name, location, hobby))

name = input("请输入名字:")
age = input("请输入年龄:")
job = input("请输入你的工作:")
hobby = input("请输入你的爱好:")

s = ‘‘‘------------ info of %s -----------
Name  : %s
Age   : %s
job   : %s
Hobbie: %s
------------- end -----------------‘‘‘ % (name, name, age, job, hobby)
# print(s)
name = ‘sylar‘
# 如果你的字符串中出现了%s这样的格式化的内容. 后面的%都认为是格式化.如果想要使用%. 需要转义 %%
print("我叫%s, 我已经学习了2%%的python了" % (name))
print("我叫周润发. 我已经活了50%了")

print(1+1)
print(1-1)
print(1*2)
print(1/2)

print(10%3) # 计算余数  10/3=3......1

n = 49
if n % 2 == 1:
    print("奇数")
else:
    print("偶数")

print(10//3) # 整除. 地板除. 计算商

print(5**3) # 5的2次幂  m**n  m的n次幂

a = 10
b = 20
print(a == b) # 等于
print(a != b)   # 不等于

a = 1
b = 2
a += b # a = 3    a+=b  => a = a + b
# a *= b  =>  a = a * b
print(a)
print(b)

# 逻辑运算符
# 1. and 并且的含义. 左右两端同时为真. 结果才能是真.
# 2. or 或者的含义. 左右两端有一个是真. 结果就是真. 所有的条件都是假. 结果才是假
# 3. not 取反 非真既假, 非假既真
# 顺序: () => not => and => or  相同的运算. 从左往右算

print(1>2 and 4<6 or 5>7)
print(1 > 2 or 3 > 4)
print(5>3 or 4<6)
print(5>3 or 4>6)

print(3>4 or 4<3  and  1==1) # False
print(1 < 2  and  3 < 4 or 1>2 ) # True
print(2 > 1  and  3 < 4 or 4 > 5 and  2 < 1) # True
print(1 > 2  and  3 < 4 or 4 > 5 and  2 > 1  or 9 < 8) # False
print(1 > 1  and  3 < 4 or 4 > 5 and  2 > 1  and  9 > 8 or 7 < 6) # False
print(not  2 > 1  and 3 < 4  or 4 > 5  and 2 > 1  and 9 > 8  or 7 < 6) # False

# x or y 如果x是0 返回y, 如果x是非零, 返回x
print(1 or 2) # 1
print(1 or 0) # 1
print(0 or 1) # 1
print(0 or 2) # 2
print(0 or 1 or 2 or 3)
print(3 or 0 or 1 or 0 or 2)

# and和or相反. 不要去总结and.  记住or
print(1 and 2) # 2
print(0 and 2) # 0
print(1 and 0) # 0
print(0 and 1) # 0

print(1 and 2 or 3)
print(1 or 2 and 3)

# False: 0, True: 1(非零)
print(1 and 2>3)
print(2>3 and 1)
print(1 > 2 or 0 and 3 < 6 or 5) # 先算and 后算or
print(2**32)