★☆☆ - You should be able to do it based on Python knowledge plus the text.
★★☆ - You will need to do extra thinking and some extra reading/searching.
★★★ - The answer is difficult to find by a simple search, requires you to do a considerable amount of extra work by yourself (feel free to ignore these exercises if you're short on time).
Note: Some of the exercises in this section are way beyond what we cover. Instead, the exercises are a review of your general python programming knowledge. You can safely ignore these exercises, they are not necessary for what we learn later.
def div_xy(x, y): return x / y def div_by_zero(x): return div_xy(x, 0.0)
import the module and execute the
div_xy function to divide 10 by 2.
P.S. You do not need to worry about an
__init__.py file if the module is in the same directory.
Try to explain the differences between what you see.
%xmode Plain by_zero.div_by_zero(3)
%xmode Context by_zero.div_by_zero(3)
%xmode Verbose by_zero.div_by_zero(3)
import by_zero by_zero.div_by_zero(3)
%timeitto time a function that sums the elements of a list, compare it with
You can use
np.arange(1024) to create a list of the first 1024 integers.
Here is a start (this exercise ought to take a while to run):
def sums_all(l): pass
import numpy as np long_list = np.arange(1024) %timeit np.sum(long_list) %timeit # your function
import numpy as np long_list = np.arange(32256)