raw_input function in Python
Question:
What is the raw_input function? Is it a user interface? When do we use it?
Answers:
It presents a prompt to the user (the optional arg of raw_input([arg])), gets input from the user and returns the data input by the user in a string. See the docs for raw_input().
Example:
name = raw_input("What is your name? ")
print "Hello, %s." % name
This differs from input() in that the latter tries to interpret the input given by the user; it is usually best to avoid input() and to stick with raw_input() and custom parsing/conversion code.
Note: This is for Python 2.x
The “input” function converts the input you enter as if it were python code. “raw_input” doesn’t convert the input and takes the input as it is given. Its advisable to use raw_input for everything.
Usage:
>>a = raw_input()
>>5
>>a
>>'5'
If I let raw_input like that, no Josh or anything else.
It’s a variable,I think,but I don’t understand her roll 🙁
The raw_input function prompts you for input and
returns that as a string. This certainly worked for
me. You don’t need idle. Just open a “DOS prompt”
and run the program.
This is what it looked like for me:
C:temp>type test.py
print "Halt!"
s = raw_input("Who Goes there? ")
print "You may pass,", s
C:temp>python test.py
Halt!
Who Goes there? Magnus
You may pass, Magnus
I types my name and pressed [Enter] after the program
had printed “Who Goes there?”
raw_input() was renamed to input() in Python 3.
Another example method, to mix the prompt using print, if you need to make your code simpler.
Format:-
x = raw_input () — This will return the user input as a string
x= int(raw_input()) — Gets the input number as a string from raw_input() and then converts it to an integer using int().
print 'nWhat's your name ?',
name = raw_input('--> ')
print 'nHow old are you, %s?' % name,
age = int(raw_input())
print 'nHow tall are you (in cms), %s?' % name,
height = int(raw_input())
print 'nHow much do you weigh (in kgs), %s?' % name,
weight = int(raw_input())
print 'nSo, %s is %d years old, %d cms tall and weighs %d kgs.n' %(
name, age, height, weight)
raw_input is a form of input that takes the argument in the form of a string whereas the input function takes the value depending upon your input.
Say, a=input(5) returns a as an integer with value 5 whereas
a=raw_input(5) returns a as a string of "5"
The raw_input() function reads a line from input (i.e. the user) and returns a string
Python v3.x as raw_input() was renamed to input()
PEP 3111: raw_input() was renamed to input(). That is, the new input() function reads a line from sys.stdin and returns it with the trailing newline stripped. It raises EOFError if the input is terminated prematurely. To get the old behavior of input(), use eval(input()).
What is the raw_input function? Is it a user interface? When do we use it?
It presents a prompt to the user (the optional arg of raw_input([arg])), gets input from the user and returns the data input by the user in a string. See the docs for raw_input().
Example:
name = raw_input("What is your name? ")
print "Hello, %s." % name
This differs from input() in that the latter tries to interpret the input given by the user; it is usually best to avoid input() and to stick with raw_input() and custom parsing/conversion code.
Note: This is for Python 2.x
The “input” function converts the input you enter as if it were python code. “raw_input” doesn’t convert the input and takes the input as it is given. Its advisable to use raw_input for everything.
Usage:
>>a = raw_input()
>>5
>>a
>>'5'
If I let raw_input like that, no Josh or anything else.
It’s a variable,I think,but I don’t understand her roll 🙁
The raw_input function prompts you for input and
returns that as a string. This certainly worked for
me. You don’t need idle. Just open a “DOS prompt”
and run the program.
This is what it looked like for me:
C:temp>type test.py
print "Halt!"
s = raw_input("Who Goes there? ")
print "You may pass,", s
C:temp>python test.py
Halt!
Who Goes there? Magnus
You may pass, Magnus
I types my name and pressed [Enter] after the program
had printed “Who Goes there?”
raw_input() was renamed to input() in Python 3.
Another example method, to mix the prompt using print, if you need to make your code simpler.
Format:-
x = raw_input () — This will return the user input as a string
x= int(raw_input()) — Gets the input number as a string from raw_input() and then converts it to an integer using int().
print 'nWhat's your name ?',
name = raw_input('--> ')
print 'nHow old are you, %s?' % name,
age = int(raw_input())
print 'nHow tall are you (in cms), %s?' % name,
height = int(raw_input())
print 'nHow much do you weigh (in kgs), %s?' % name,
weight = int(raw_input())
print 'nSo, %s is %d years old, %d cms tall and weighs %d kgs.n' %(
name, age, height, weight)
raw_input is a form of input that takes the argument in the form of a string whereas the input function takes the value depending upon your input.
Say, a=input(5) returns a as an integer with value 5 whereas
a=raw_input(5) returns a as a string of "5"
The raw_input() function reads a line from input (i.e. the user) and returns a string
Python v3.x as raw_input() was renamed to input()
PEP 3111: raw_input() was renamed to input(). That is, the new input() function reads a line from sys.stdin and returns it with the trailing newline stripped. It raises EOFError if the input is terminated prematurely. To get the old behavior of input(), use eval(input()).