So many nuances with string methods :)

The str.replace() method takes an optional count argument so you for example can only replace the first match:

>>> s = "hello world, hello again"
>>> s.replace("hello", "bye")
'bye world, bye again'
>>> s.replace("hello", "bye", 1)
'bye world, hello again'

#python

@karenshancock if you want to use programming for mathematical and scientific applications, then Python is perfect because all the tools it has in that area, starting from modules such as NumPy (Numerical Python) and Matplotlib (plotting) and many others.

You can use typing.get_type_hints() (or __annotations__) to get the type annotations of an object.

#python

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