2、 Real content 2 character string ：
a-"sir,Python"
b="Go Home"
c＝"hello world
d＝"02368hello"
1) Put the variable a Subtract all capital letters (upper)
2) Get string b Tension of
3) character string a and b Merge
4)a Last 6 Characters and b Last 4 Merge characters
5) Judge the variable star d Are all characters
6) Put the variable c All converted to uppercase
7) from a/b/c Three variables are calculated to form a string “Python go WORLD”:
8) Put the variable b repeat 3 Secondary output
Program source code （ Please copy and paste the program source code in the following text box ）：
