Learning immediately: https://edu.csdn.net/course/play/6861/326740?utm_source=blogtoedu
string of integer and floating point type int can be transferred
bool Boolean True, False
Non-numeric 0 is the true non-empty can be transferred
strptime turn datetime
eg: import datetime
print(datetime.datetime.strptime('1999-7-1','%Y-%M-%D').date())
//: two divisible part of the quotient