Python determines the datatype automatically, to illustrate:
x = 3 y = "text"
It finds x is of type integer and y of type string.
Functions accept a certain datatype. For example, print only accepts the string datatype.
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If you want to print numbers you will often need casting.
In this example below we want to print two numbers, one whole number (integer) and one floating point number.
x = 3 y = 2.15315315313532 print("We have defined two numbers,") print("x = " + str(x)) print("y = " + str(y))
We cast the variable x (integer) and the variable y (float) to a string using the str() function.
What if we have text that we want to store as number? We will have to cast again.
a = "135.31421" b = "133.1112223" c = float(a) + float(b) print(c)
In the example above we cast two variables with the datatype string to the datatype float.
To convert between datatypes you can use:
|int(x)||Converts x to an integer|
|long(x)||Converts x to a long integer|
|float(x)||Converts x to a floating point number|
|str(x)||Converts x to an string. x can be of the type float. integer or long.|
|hex(x)||Converts x integer to a hexadecimal string|
|chr(x)||Converts x integer to a character|
|ord(x)||Converts character x to an integer|