Category: Python
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Find leap years in a Pandas datetime series with dt.is_leap_year
Want to find leap years in a Python Pandas datetime series? Use dt.is_leap_year:
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Pandas dt.is_month_start: Checking period boundaries in a series
Want to know if values in a Python Pandas datetime series are at the start/end of a period? Get a boolean series from:
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Getting the day of week with `dt.day_of_week` in Pandas
Use dt.day_of_week to get the day number from a Python Pandas datetime series. But is 0 Sunday or Monday? Or not used at all? Better: Use the day_name method: Good news: It returns a series of strings!Bad news: It’s 4x slower.
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Pandas .dt accessor: Extracting year, hour, and day_of_week
Want to grab a part of datetime value in a Python Pandas data frame column? Use “dt”: day_of_week returns an integer, where 0 is Monday and 6 is Sunday.
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pandas read_csv date parsing: Using the date_format keyword
Reading a CSV into Python Pandas, and parse_dates doesn’t recognize the format? Pass the date_format keyword arg: All strftime codes work!
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Take agentic coding to the next level
If you’re like me, then you’ve lately been exploring agentic coding, having AI write code on your behalf. What will be the impact on our work developing software? On hiring? On training? From what I can tell, the question isn’t whether we’ll be using agentic coding, but how we do so. Knowing how AI writes…
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Pandas parse_dates: Reading CSV date columns as datetimes
Reading a CSV into Python Pandas, and want a column to be treated as datetime values? Use parse_dates: Bonus: The PyArrow engine often (not always) parses columns that look like dates.
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pd.to_datetime: Converting a pandas string column to datetimes
Want to take a Python Pandas series of strings, and get datetime values? Use pd.to_datetime: Notice: It’s not a method! It’s a top-level pd function. Specify a non-standard “format” with a strftime string:
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Parse ISO date strings in Python with datetime.fromisoformat
If a Python string contains an ISO-formatted date, skip strptime and use datetime.fromisoformat:
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Python strptime vs. strftime: Parsing versus formatting dates
Having a tough time remembering Python strptime vs. strftime? – The “p” (strptime) is for parsing, getting a datetime from a string– The “f” (strftime) is for formatting, getting a string from a datetime For help remembering the format codes, turn to https://www.strfti.me/ !