About motor driver circuit

L293D is a typical Motor driver or Motor Driver IC which allows DC motor to drive on either direction. L293D is a 16-pin IC which can control a set of two DC motors simultaneously in any direction. It means that you can control two DC motor with a single L293D IC. Dual H-bridge Motor Driver integrated circuit(IC).

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Difference between raw_input, input and eval in python

In Python 2, raw_input() returns a string

But whereas input() tries to run the input as a Python expression. Since getting a string was almost always what you wanted, Python 3 does that with input() .

Note: input() is now raw_input() in python 3.x versions.

eval in python

Eval evaluates expressions. eval() , as the name suggests, evaluates the passed argument.

Example: Try eval(input()) and type “1+1” – this should print 2 .

Difference between expression and statement in python

Expression: Any value is an expression

Expressions are nothing but values, except they can have operations like addition or subtraction. eval evaluates the string as if it were a python expression.

Examples:

3 + 5
map(lambda x: x*x, range(10))
[a.x for a in some_iterable]
yield 7

Statement: Anything that does something is a statement. Any assignment to a variable or function call is a statement.

Examples:

if x: do_y()
return
a = 7