20240405 append

a ="hello"
print(type(a))
a=10
print(type(a))
print(id(a))
a=a+1
print(id(a))
a=[1,2,3]
print(id(a))
a.append(4)
print(a)
print(id(a))
a=1,2,3
a=1,[2,3],[4,5]
a[1].append(4)
print(a)