Python Learning 5

1. Global scope value can not is changed in function.

2. We can define a global variable in a function by using Global.

3. Rules of using variable:

• First start with the local scope, if any. IF the variable is defined here, use the value.
• enclosing scopes, starting with the innermost. These is "outside" local scopes. IF the variable is defined in any of them, use the value.
• Look in the global scope. If the variable is there, use the value.
• Finally, look in the built-in functions.
• If no value is found, an error would be thrown.

Regular Expression (for extract number from a long string):

1.

Python Learning 5