python基础

'''a = 10
b = 10
print(a == b)#数值比较

print(id(a),id(b))
print(a == b)

a = [1,2,3]
b = [1,2,3]
print(a == b)

print(id(a),id(b))
print(a is b)#判断对象是否一样

c = a
print(a is c)#判断是否为同一个对象

d = None
#prnt(d == None)
print(d is None)#判断空对象用is、is not'''
from traceback import print_tb

from setuptools.compat.py312 import PTH_ENCODING

'''sex = 0
zge = 10
print(sex == 1 and zge == 10)#and判断从左到右，若左边条件为假，直接返回False，不再判断右边,and两边都为真输出True
print(sex == 0 or zge == 20 )#or判断从左到右，若左边为真，直接返回True，不再判断右边，or两边只要有一个为真则输出True
print(zge > 5 and zge < 15)

a = 0b1010
print(~a)#~：取反； 取反公式：~a=—a-1'''

'''a = 2 ** 3 ** 2#幂函数从右到左计算
print(a)

import math

b = math.pow(2,3)#x**y 运算后的值
print(b)

print(abs(-1))#取绝对值
print(math.ceil(10.5))#向上取整
print(math.floor(10.5))#向下取整
print(math.exp(1))#求e的幂
print (math.fabs(-10.5))#以浮点数形式返回数字的绝对值
print(max(1,2,3))#返回给定参数的最大值，参数可以为序列
print(min(1,2,3))#返回给定参数的最小值，参数可以为序列
print(round(5.679,2))#round(x,n)返回x的四舍五入值，舍入到小数点后n位
print(math.sqrt(3))#返回平方值'''
'''year = 1990
if year %2 == 0:
    print(1)
else:
    print(0)'''

'''year1 = 2014
if year1 %2 == 0:
    print('能被2整除')
elif year1 %4 == 0:
    print('能被4整除')
else:
    print('既不能被2整除也不能被4整除')'''

'''year3 = 1000
if year3 % 2 == 0:
    if year3 % 5 ==0:
        print('能被2和5整除')
else:7
    print('能被2整除')'''

'''
a = input('请输入一个数字：')
a = int(a)
if a == 0:
    print('输入数字为0')
elif a > 0:
    print('输入数字为正数')
else:
    print('输入数字为负数')

a = input('请输入成绩：')
a = int(a)
if a >=60 and a <=100:
    print('及格')
else:
    print('不及格')

a = input('请输入成绩：')
a = int(a)
if a < 60:
    print('不及格')
elif 60 <= a < 80:
    print('及格')
elif 80 <= a < 90:
    print('良好')
elif 90 <= a <= 100:
    print('优秀')
else:
    print('您的输入有误')'''

'''b = 5
a = 0
while(a<5):
    print('hello')
    a += 1
else:
    print('结束')'''

'''a = int(input('请输入：'))
b = 1
while b <= a:
    print('这是第',b,'行')
    b += 1'''

'''a = 1
while a <= 10:
    b = 1
    while b<=20:
        print(b,sep=' ',end='')
        b +=1
    print()
    a +=1'''

'''b = int(input('请输入'))
a = 1
num = 0
while a <= b:
    num = num+a
    a += 1
print(num)


sum = 0
while True:
    A = int(input('请输入'))
    sum +=A
    if A < 0:
        break
print('您刚输入的正数之和为',sum)'''


'''sum = 0
s = input('请输入')
for a in s:
    if a == '=':
        sum += 1
print("有",sum,'个等号')'''

'''matrix = [
 [1, 2, 3],
 [4, 5, 6],
 [7, 8, 9]
]
for row in matrix: # 外层循环遍历行
    for item in row: # 内层循环遍历列
        print(item, end=" ")
    print() # 换行'''

'''作业a = 1
b = 1
while b <= 20:
    while a <= 5:
        print(b,sep=' ',end=" ")
        b +=1
        a +=1
    a = 1
    print()'''

'''for i in range(1,10):
    print(i)'''

'''
for i in range(1,21):
    print(i,end=' ')'''

'''sum = 0
for a in range(1,100,2):
    sum += a
print(sum)'''

'''#作业
for a in range(1,10):
    for b in range (1,10):
        if b <= a:
            print(b,'×',a,'=',b*a,end=" ")
    print()'''

'''for x in range(5):
    if x % 2 == 0:
        continue
    print(x)'''

'''for letter in 'python': 
    if letter == 'o':
        continue
    print ('当前字母 :', letter)'''