This is a list of python tips and techniques that I have run across when using this language. It also serves as a quick reminder/refresher page for me. It is a mix of general python and python in Jupyter.

Lists

Count the total number of unique items in list

A = {}
for i in my_list:
	A[i] = i
len(A)

Count each unique item in list

A = {}
for i in mylist:
    if i not in A:
        A[i]=1
    else:
        A[i]=A[i]+1
print(A)

Jupyter

Plotting in Jupyter

In order to plot inline, use the following

%matplotlib inline

Scatter plots

Scatter plots require a third variable to indicate the size of the dot. Without this variable, the scatter command fails.

import matplotlib.pyplot as plt
plt.scatter(x,y,0.1)

Counting

Counting in binary

Starting from the first digit, everything is halved each time you put 1 in the next place, so shift the pointer by halving the previous value.

1000000       1100000
---|---       -|-----