Python first week (second day) My Python growth is one months to get the Python data mining done! (03)

Tag: expression evaluation list Change expr exp meta-ancestor evaluation data Mining world

Generator expression:

(Expr for ITER in iterable [if condition])

does not evaluate the expression, the difference between the same list parsing

Ganso

The contents of the tuple cannot be modified by the same list, but the elements in the list [3,4,5,6] in (1,2,3,4,[3,4,5,6],true, ()) can be changed, and the pointer to each object is stored 3,4,5,6

String:

Str01 + Str02 generate a new string

Str01 * 3 Generating a new string

x = [' Hello ', ' world ', ' python ']

". Join (X)

Python first week (second day) My Python growth is one months to get the Python data mining done! (03)