Python 3 – Files I/O |
Introduction :
This chapter covers all the basic
I/O functions available in Python 3. For more functions, please refer to the
standard Python documentation.
Printing to the Screen
The simplest way to produce output
is using the print
statement
where you can pass zero or more expressions separated by commas. This function
converts the expressions you pass into a string and writes the result to
standard output as follows-
#!/usr/bin/python3
print ("Python
is really a great language,", "isn't it?")
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This produces the following result on your
standard screen-
Python is really a great language, isn't it?
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Reading Keyboard Input
Python 2 has two built-in
functions to read data from standard input, which by default comes from the
keyboard. These functions are input() and raw_input()
In Python 3, raw_input() function
is deprecated. Moreover, input() functions read data from keyboard as string,
irrespective of whether it is enclosed with quotes ('' or "" ) or not.
The input Function
The input([prompt]) function is equivalent to raw_input,
except that it assumes that the input is a valid Python expression and returns
the evaluated result to you.
Invoke interactive
mode :
>>>
x=input("something:")
something:10
>>> x
'10'
>>>
x=input("something:")
something:'10' #entered data treated as string
with or without ''
>>> x
"'10'"
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