Currently I'm learning Python3, and I already have some experience with C. I need to shift string to get rid of two first bytes. Here's code in C:
char *a = "Hello World";
a += 2;
printf ("%s", a)
this program will output "llo World"
I was wondering if there is a way of doing such thing in Python efficiently, without copying the whole string.
The closest operation in 2.x would be creating a buffer from the string and then slicing that. Creating the buffer is an additional operation, but only needs to be performed once since the buffer can be reused.
>>> a = 'Hello world'
>>> b = buffer(a)
>>> print b[2:]
llo world
>>> print b[:5]
Hello
3.x doesn't have buffer, but you shouldn't be trying to emulate the C code in Python regardless. Figure out what you're actually trying to do, and then write the appropriate Pythonic code for it.
buffer? I know it has memoryview, but I don't think that works on str objects.
buffer is gone in 3.x. But you shouldn't be trying to emulate C in Python regardless, unless you want to write slower code.Python is higher level than C and understands what a string is. You can do:
s = "Hello World"
print(s[2:])
You can find more here: https://docs.python.org/3/tutorial/introduction.html#strings.
Sure there is and is better than C
a = "Hello World"
print a[2:]
This is called slicing
Refer the image
FYI : You don't need to declare any variable, you can do the operations on the string directly
"Hello world"[2:] # llo world
