Category: Python Answers

Sometimes, we want to import module from string variable with Python.

In this article, we’ll look at how to import module from string variable with Python.

How to import module from string variable with Python?

To import module from string variable with Python, we can use the importlib.imnport_module method.

For instance, we write

import importlib

i = importlib.import_module("matplotlib.text")

to call importlib.import_module with the module name string to import the module.

Conclusion

To import module from string variable with Python, we can use the importlib.imnport_module method.

Sometimes, we want to split a text into sentences with Python.

In this article, we’ll look at how to split a text into sentences with Python.

How to split a text into sentences with Python?

To split a text into sentences with Python, we can use the Natural Language Toolkit.

We install it with

pip install --user -U nltk

Then we use it by writing

import nltk.data

tokenizer = nltk.data.load('tokenizers/punkt/english.pickle')
fp = open("test.txt")
data = fp.read()
print '\n-----\n'.join(tokenizer.tokenize(data))

We call open to open the test.txt file.

Then we call read to read the file.

Then we have tokenizer.tokenize(data) to split the file data text into sentences.

Conclusion

To split a text into sentences with Python, we can use the Natural Language Toolkit.

Sometimes, we want to modify a text file with Python.

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

How to modify a text file with Python?

To modify a text file with Python, we can call the write method.

For instance, we write

with open("foo.txt", "a") as f:
     f.write("new line\n")

to open the foo.txt file with open.

Then we call f.write to append "new line\n" into the file.

We can prepend text by call seek with 0 to rewind to the beginning of the file.

For instance, we write

with open("foo.txt", "r+") as f:
     old = f.read()
     f.seek(0)
     f.write("new line\n" + old)

to call f.read to read the contents of the file into a string.

Then we call seek with 0 to rewind to the beginning of the file.

Then we call f.write to overwrite the file with "new line\n" + old.

Conclusion

To modify a text file with Python, we can call the write method.

Sometimes, we want to modify tick label text with Python matplotlib.

In this article, we’ll look at how to modify tick label text with Python matplotlib.

How to modify tick label text with Python matplotlib?

To modify tick label text with Python matplotlib, we can call set_xticklabels.

For instance, we write

import matplotlib.pyplot as plt

fig, ax = plt.subplots()
fig.canvas.draw()

labels = [item.get_text() for item in ax.get_xticklabels()]
labels[1] = 'Testing'

ax.set_xticklabels(labels)

plt.show()

to create the labels with [item.get_text() for item in ax.get_xticklabels()].

Then we call ax.set_xticklabels to set labels as the label values for the x-axis.

Conclusion

To modify tick label text with Python matplotlib, we can call set_xticklabels.

Sometimes, we want to fix UnicodeEncodeError: ‘charmap’ codec can’t encode characters with Python.

In this article, we’ll look at how to fix UnicodeEncodeError: ‘charmap’ codec can’t encode characters with Python.

How to fix UnicodeEncodeError: ‘charmap’ codec can’t encode characters with Python?

To fix UnicodeEncodeError: ‘charmap’ codec can’t encode characters with Python, we can set the encodings argument when we open the file.

For instance, we write

with open(fname, "w", encoding="utf-8") as f:
    f.write(html)

to call open with the fname file name path and the encoding argument set to utf-8 to open the file at fname as a Unicode encoded file.

Conclusion

To fix UnicodeEncodeError: ‘charmap’ codec can’t encode characters with Python, we can set the encodings argument when we open the file.