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13.1 Python eval() and fixed size input

    In python,it is possible to ask the user for input in order to enhance the flexibility.To get the user input ,the input() method is used. However,Python 2.7 uses the raw_input() method. input() method is widely used for standard input operations. 

eval()
    The eval() function ,as the name indicates is used to evaluate an expression.The argument within the eval function must be a string
syntax:
eval("expression")
Program
a="23+67%58-18//24"
result=(eval(a))
print(result)
Output
32
It is also possible to evaluate an expression from user.For this the eval() is used with input()
syntax:
eval(input("expression"))
Program
a=eval(input("enter expression:"))
print(a)
Output
enter expression:23+67%58-18//24
32
Suppose you need to get only the first character from the user input,you can use index[] .
Program
a=input("Get a first character:"))[0]
print(a)
b=input("Get the second character:"))[1]
print(b)
Output
Get a first character:Apple
A
Get a second character:Apple
p
Suppose you need to get only first 5 characters from the user input,you can use index[] .
Program
a=input("Get a first 5 characters:"))[0:5]
print(a)

Output
Get a first character:Apple2346t
Apple
Similarly,index can be used to get specific range of the user input.
Interested in learning python,do check out the video below!!
Happy Learning!!

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