Category: Python Answers

Sometimes, we want to turn string into operator with Python.

In this article, we’ll look at how to turn string into operator with Python.

How to turn string into operator with Python?

To turn string into operator with Python, we can use the operator module.

For instance, we write

import operator
ops = { "+": operator.add, "-": operator.sub }

print(ops["+"](1,1))

to create the ops dict that has the operator strings as keys and the operators as the values.

Then we can get the operator by the string key and use them with operands.

Conclusion

To turn string into operator with Python, we can use the operator module.

Sometimes, we want to fix sqlite3.ProgrammingError: Incorrect number of bindings supplied. The current statement uses 1, and there are 8 supplied with Python SQLite parameter substitution.

In this article, we’ll look at how to fix sqlite3.ProgrammingError: Incorrect number of bindings supplied. The current statement uses 1, and there are 8 supplied with Python SQLite parameter substitution.

How to fix sqlite3.ProgrammingError: Incorrect number of bindings supplied. The current statement uses 1, and there are 8 supplied with Python SQLite parameter substitution?

To fix sqlite3.ProgrammingError: Incorrect number of bindings supplied. The current statement uses 1, and there are 8 supplied with Python SQLite parameter substitution, we’ve to make sure that the 2nd argument of execute is a list.

For instance, we write

cursor.execute("SELECT weight FROM Equipment WHERE name = ?", [item])

to call cursor.execute with a SQL string and a list of items to replace the ? placeholders with.

Conclusion

To fix sqlite3.ProgrammingError: Incorrect number of bindings supplied. The current statement uses 1, and there are 8 supplied with Python SQLite parameter substitution, we’ve to make sure that the 2nd argument of execute is a list.

Sometimes, we want to use Python Requests with JavaScript pages.

In this article, we’ll look at how to use Python Requests with JavaScript pages.

How to use Python Requests with JavaScript pages?

To use Python Requests with JavaScript pages, we can create an HTMLSession with requests_html.

To install it, we run

pip install requests-html

Then, we write

from requests_html import HTMLSession

session = HTMLSession()
r = session.get('http://www.example.com')
r.html.render() 

to create an HTMLSession.

Then we call get with the URL we want to make a request to.

And then we call html_render to render the page with JavaScript.

Conclusion

To use Python Requests with JavaScript pages, we can create an HTMLSession with requests_html.

Sometimes, we want to remove emojis from a string in Python.

In this article, we’ll look at how to remove emojis from a string in Python.

How to remove emojis from a string in Python?

To remove emojis from a string in Python, we can create a regex that matches a list of emojis.

For instance, we write

import re

text = u'This is a smiley face \U0001f602'
print(text) # with emoji

def de_emojify(text):
    regex_pattern = re.compile(pattern = "["
        u"\U0001F600-\U0001F64F" 
        u"\U0001F300-\U0001F5FF"
        u"\U0001F680-\U0001F6FF"
        u"\U0001F1E0-\U0001F1FF"
                           "]+", flags = re.UNICODE)
    return regex_pattern.sub(r'', text)

print(de_emojify(text))

to call re.compile with pattern set to a string that matches the character code ranges for emojis.

\U0001F600-\U0001F64F is the code range for emoticons.

\U0001F300-\U0001F5FF is the range for symbols and pictographs.

\U0001F680-\U0001F6FF" is the range for transport and map symbols.

\U0001F1E0-\U0001F1FF is the range for flag emojis in iOS.

Then we call regex_pattern.sub to replace the emojis in text with empty strings.

Conclusion

To remove emojis from a string in Python, we can create a regex that matches a list of emojis.

Sometimes, we want to retrieve parameters from a URL with Python.

In this article, we’ll look at how to retrieve parameters from a URL with Python.

How to retrieve parameters from a URL with Python?

To retrieve parameters from a URL with Python, we can use the parse_qs function.

For instance, we write

from urllib.parse import urlparse
from urllib.parse import parse_qs

url = 'https://www.example.com/some_path?some_key=some_value'
parsed_url = urlparse(url)
captured_value = parse_qs(parsed_url.query)['some_key'][0]

to call urlparse with the url string to parse the URL into an object.

Then we get the query string with parsed_url.query.

And we call parse_qs with the returned query string to parse it into a dict.

Finally, we get the value with key some_key from the query string and use [0] to get the first returned entry.

Conclusion

To retrieve parameters from a URL with Python, we can use the parse_qs function.