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Python contains several built-in functions to convert values from one data type to another data type.
The int function takes string and coverts it to an integer.
>>>s = "1234" # s is string
>>>i = int(s) # string converted to int
>>>print i+2
-------------------------
1236
The float function converts strings into float number.
>>>s = "1234.22" # s is string
>>>i = float(s) # string converted to float
>>>print i
-------------------------
1234.22

There are two ways in which objects can be copied in python.
Shallow copy & Deep copy.
Shallow copies duplicate as minute as possible whereas Deep copies duplicate everything.
If a is object to be copied then
-copy.copy(a) returns a shallow copy of a.
-copy.deepcopy(a) returns a deep copy of a.