In a tutorial, I read that that there is a difference between input and raw_input. I discovered that they changed the behavior of these functions in the Python 3.0. What is the new behavior?
And why in the python console interpreter this
x = input() Sends an error but if I put it in a file.py and run it, it does not?
In python 2.x, raw_input() returns a string and input() evaluates the input in the execution context in which it is called
>>> x = input() "hello" >>> y = input() x + " world" >>> y 'hello world' In python 3.x, input has been scrapped and the function previously known as raw_input is now input. So you have to manually call compile and than eval if you want the old functionality.
python2.x python3.x raw_input() --------------> input() input() -------------------> eval(input()) In 3.x, the above session goes like this
>>> x = eval(input()) 'hello' >>> y = eval(input()) x + ' world' >>> y 'hello world' >>> So you were probably getting an error at the interpretor because you weren't putting quotes around your input. This is necessary because it's evaluated. Where you getting a name error?
input() vs raw_input()
raw_input collects the characters the user types and presents them as a string. input() doesn't just evaluate numbers but rather treats any input as Python code and tries to execute it. Knowledgeable but malicious user could type in a Python command that can even deleted a file. Stick to raw_input() and convert the string into the data type you need using Python's built in conversion functions.
Also input(), is not safe from user errors! It expects a valid Python expression as input; if the input is not syntactically valid, a SyntaxError will be raised.
Its simple:
raw_input() returns string valuesinput() return integer valuesFor Example:
1.
x = raw_input("Enter some value = ") print x Output:
Enter some value = 123 '123' 2.
y = input("Enter some value = ") print y Output:
Enter some value = 123 123 Hence if we perform x + x = It will output as 123123
while if we perform y + y = It will output as 246
