Author: John Au-Yeung

Sometimes, we want to removing white space around a saved image with Python matplotlib

In this article, we’ll look at how to removing white space around a saved image with Python matplotlib

How to removing white space around a saved image with Python matplotlib?

To removing white space around a saved image with Python matplotlib, we call plt.savefig with the bbox_inches argument set to 'tight'.

For instance, we write

plt.savefig('myfile.png', bbox_inches="tight")

to call savefig to save the flots to myfile.png.

We set bbox_inches to 'tight' to reduce padding between the plots.

Conclusion

To removing white space around a saved image with Python matplotlib, we call plt.savefig with the bbox_inches argument set to 'tight'.

Sometimes, we want to append multiple values for one key in a dictionary with Python.

In this article, we’ll look at how to append multiple values for one key in a dictionary with Python.

How to append multiple values for one key in a dictionary with Python?

To append multiple values for one key in a dictionary with Python, we can set the value for a key to a list and the append to the list.

For instance, we write

years_dict = dict()

for line in list:
    if line[0] in years_dict:
        years_dict[line[0]].append(line[1])
    else:
        years_dict[line[0]] = [line[1]]

to loop through the list list with a for loop.

In it, we check if line[0] is a key in the years_dict dict.

If it is, then we call append to append line[1] into the list.

Otherwise, we assign a list with line[1] in it as the value of the entry with key line[0].

Conclusion

To append multiple values for one key in a dictionary with Python, we can set the value for a key to a list and the append to the list.

Sometimes, we want to check if a word is an English word with Python.

In this article, we’ll look at how to check if a word is an English word with Python.

How to check if a word is an English word with Python?

To check if a word is an English word with Python, we can use the PyEnchant library.

To install it, we run

pip install pyenchant

Then we use it with

import enchant

d = enchant.Dict("en_US")
is_us_english =  d.check("Hello")

to create a Dict object by using the enchant.Dict class with the locale for the dictionary.

Then we call d.check with the word we want to check if it’s English or not.

Conclusion

To check if a word is an English word with Python, we can use the PyEnchant library.

Sometimes, we want to check if one of the following items is in a list with Python.

In this article, we’ll look at how to check if one of the following items is in a list with Python.

How to check if one of the following items is in a list with Python?

To check if one of the following items is in a list with Python, we can use the any function.

For instance, we write

a = [1,2,3,4]
b = [2,7]
any(x in a for x in b)

to check if any element in list b is also in a.

We call any with the the iterator that has the items in b that’s also in a with x in a for x in b to do the check.

Conclusion

To check if one of the following items is in a list with Python, we can use the any function.

Sometimes, we want to create a simple XML file using Python.

In this article, we’ll look at how to create a simple XML file using Python.

How to create a simple XML file using Python?

To create a simple XML file using Python, we can use the xml.etreer.cElementTree module.

For instance, we write

import xml.etree.cElementTree as ET

root = ET.Element("root")
doc = ET.SubElement(root, "doc")

ET.SubElement(doc, "field1", name="blah").text = "some value1"
ET.SubElement(doc, "field2", name="asdfasd").text = "some vlaue2"

tree = ET.ElementTree(root)
tree.write("filename.xml")

to create an element with the ET.Element class.

And we create a child element with the ET.SubElement class.

Then we set the text content of the elements by setting the text property to the values we want.

Then we create the DOM tree object with ET.ElementTree.

And we call write to write the file to the path we called write with.

Conclusion

To create a simple XML file using Python, we can use the xml.etreer.cElementTree module.