python基础

print('HELLO PYTHON')

单行注释

#这是注释

多行注释

"""
broken heart
"""

进制之间的转换

bin   二进制

oct   八进制

int   十进制

hex   十六进制

decimal = 10
bin_num = 0b1010
print(bin(decimal))
print(int(bin_num))

布尔类型

print(bool(0))

位运算符

按位左移运算符（<<)

print(bin(a<<4))

按位右移运算符（>>)

按位与运算符（&）

按位或运算符（|）

按位异或运算符(^)

按位取反(~)???

year = 2020
month = 2
if month in (1,3,5,7,8,10,12):
    print("%d月有31天"% month)
elif month in(4,6,9,11):
    print("%d月有30天" % month)
elif month == 2:
    if year % 400 == 0 or year % 4 == 0 and year % 100 != 0:
        print("%d年%d月有29天" % (year,month))
    else:
        print("%d年d月有28天" % (year,month))

i = 1
result = 0
while i <=0:
    result += i
    i += 1
print(result)

result = result + i

i = i + 1

while嵌套循环

i = 1
while i < 6:
    j = 0
    while j < i:
        print("*",end='')
        j +=1
    print()
    i += 1

for i in range(5):
    print(i)

range左开右闭