Author: John Au-Yeung

Sometimes, we want to convert all of the items in a list to floats with Python.

In this article, we’ll look at how to convert all of the items in a list to floats with Python.

How to convert all of the items in a list to floats with Python?

To convert all of the items in a list to floats with Python, we can use list comprehension.

For instance, we write

l = [float(i) for i in lst]

to convert all the items in the lst list to floats with float(i) for i in lst.

And we put all the items in a new list.

float converts values to a floating point number.

Conclusion

To convert all of the items in a list to floats with Python, we can use list comprehension.

Sometimes, we want to delete items from a dictionary while iterating over it with Python.

In this article, we’ll look at how to delete items from a dictionary while iterating over it with Python.

How to delete items from a dictionary while iterating over it with Python?

To delete items from a dictionary while iterating over it with Python, we can use the del operator.

For instance, we write

for k in list(my_dict.keys()):
    if mydict[k] == 3:
        del mydict[k]

to loop through the keys in the my_dict dictionary that we get from the keys method.

Then we check if mydict[k] is 3 and we delete the entry if it’s true.

Conclusion

To delete items from a dictionary while iterating over it with Python, we can use the del operator.

Sometimes, we want to generate keyboard events with Python.

In this article, we’ll look at how to generate keyboard events with Python.

How to generate keyboard events with Python?

To generate keyboard events with Python, we can use the keyboard package.

To install it, we run

pip install keyboard

Then we use it by writing

import keyboard

keyboard.press_and_release('ctrl+tab')

to call keyboard.press_and_release with 'ctrl+tab' to press ctrltab programmatically.

Conclusion

To generate keyboard events with Python, we can use the keyboard package.

Sometimes, we want to write Unicode text to a text file with Python.

In this article, we’ll look at how to write Unicode text to a text file with Python.

How to write Unicode text to a text file with Python?

To write Unicode text to a text file with Python, we call the file’s open method with the encoding argument.

For instance, we write

s = "南"
f = open("t1.txt", "w", encoding="utf-8")
f.write(s)
f.close()

to open the t1.txt file with write permission with open.

We call it with encoding set to 'utf-8' to open it as a Unicode text file.

Then we call f.write with string s to write the content to t1.txt.

And then we call close to close the file.

Conclusion

To write Unicode text to a text file with Python, we call the file’s open method with the encoding argument.

Sometimes, we want to find local maxima or minima with Numpy in a 1D Numpy array with Python.

In this article, we’ll look at how to find local maxima or minima with Numpy in a 1D Numpy array with Python.

How to find local maxima or minima with Numpy in a 1D Numpy array with Python?

To find local maxima or minima with Numpy in a 1D Numpy array with Python, we can use the argrelextrema methods.

For instance, we write

import numpy as np
from scipy.signal import argrelextrema

x = np.random.random(12)

argrelextrema(x, np.greater)
argrelextrema(x, np.less)

to create a NumPy array with

x = np.random.random(12)

Then we find the local maxima of array x by calling argrelextrema with x and np.greater.

Likewise, we find the local minima of array x by calling argrelextrema with x and np.less.

Conclusion

To find local maxima or minima with Numpy in a 1D Numpy array with Python, we can use the argrelextrema methods.