Tips¶
collections.Counter
is similar to a dict
object.
You can iterate through it similarly to how you iterate through a dict
.
Sort Collections in Python
Tips¶
- You can use the built-in function
sorted
to sort any iterable collection. It always a (new) list containing sorted data. Some mutable collections (e.g., list) have thee methodsort
to sort elements in-place. Bothsorted
andCollection.sort
accept an argumentkey
for specifying customized sorting criteria.
Sort a List¶
Convert a Tensor to a Numpy Array or List in PyTorch
Tips¶
There are multiple ways to convert a Tensor to a numpy array in PyTorch.
First,
you can call the method Tensor.numpy
.
my_tensor.numpy()
Second,
you can use the function numpy.array
.
import numpy as np
np.array(my_tensor)
It is suggested that you use the function numpy.array
to convert a Tensor to a numpy array.
The reason is that numpy.array
is more generic.
You can also use it to convert other objects (e.g., PIL.Image)
to numpy arrays
while those objects might not have a method named numpy
Convert an Image to Differnt Modes Using Pillow in Python
Get Information of Application Windows in Python
Tips¶
- PyGetWindow does not support Linux currently.
Installation¶
pip3 install pyobjc-framework-quartz pygetwindow
Hands on the datetime Module in Python
Comment¶
A Datetime
object cannot be compared with a string directly.
However,
pandas Series of datetime objects can be compared with string date directly
(both by operators and methods).
The comparison is done by parsing the string to a datetime object.
An exception will be thrown if the string cannot be parsed into a datetime object.