1.int + - 0
2.float 2.2 1.1 3.6
3.bool True=1 Flase=0
4.str " ' """ '''
*n1=10
n2=-10
n3=0
print(n1,type(n1)) n1 class int
print(n2,type(n2)) n2 class int
print(n3,type(n3)) n3 class int
**m1=2.2
m2=1.1
print(m1,type(m1))
print(m2,type(m2))
print(2.2+1.1) =3.000000000003
from decimal import Decimal
print(Decimal('2.2')+Decimal('1.1')) =3.3
***b1=True b2=Flase
print(b1+1)
print(b2+1)
****v1='123'
v2="123"
v3=‘’‘123’‘’
v4="""123“”"
print(v1,type(v1))
print(v2,type(v2))
print(v3,type(v3))
print(v4,type(v4))
print(‘123’）
print（“123”）
print('''123''') three引号引导的代码can be divided into two lines
print("""123""")
