Is there an easy way in python to add a permanent character (or string) to several prints ?
Example:
add_string('Hello ')
print('World')
print('You')
would output
Hello World
Hello You
Is there a way to do it without changing the following part of the code:
print('World')
print('You')
You could have your add_string function overwrite the builtin print function:
from __future__ import print_function # for python 2.x
def add_string(prefix):
def print_with_prefix(*args, **kwargs):
if prefix:
args = (prefix,) + args
__builtins__.print(*args, **kwargs)
global print
print = print_with_prefix
You can set or unset the prefix while preserving any other arguments passed to print.
print("foo") # prints 'foo'
add_string(">>>")
print("bar") # prints '>>> bar'
print("bar", "42", sep=' + ', end="###\n") # prints '>>> + bar + 42###'
add_string(None)
print("blub") # prints 'blub'
If you are using the print statement (i.e. print "foo" instead of print("foo")) then you have to redefine sys.stdout with a custom writer:
import sys
stdout = sys.stdout
def add_string(prefix):
class MyPrint:
def write(self, text):
stdout.write((prefix + text) if text.strip() else text)
sys.stdout = MyPrint() if prefix else stdout
Because you want to add it to several, but not all, it might be best to use a self-made function that adds something, so you can just call that function for the cases where you want to add it, and don't in the cases you don't want to add it
def custom_print(text):
print('Hello ' + text)
custom_print('World') # output: Hello World
try like this:
def my_print(custom="Hello",my):
print(custom + ' ' + my)
my_print(my='world')
my_print(my="you")
my_print(custom="Hey",'you')
output:
Hello world
Hello you
Hey you
you can use custom key argument of form kwarg = Value
for more check here https://docs.python.org/3/tutorial/controlflow.html#keyword-arguments
from __future__ import print_function # needed for python 2.7
def print(*args, **kwargs):
return __builtins__.print("Hello",*args, **kwargs)
print('World')
Hello World
