Data analysis in Python with pandas - How do I apply a function to a pandas Series or DataFrame?

Have you ever struggled to figure out the differences between apply, map, and applymap? In this video, I'll explain when you should use each of these methods and demonstrate a few common use cases. Watch the end of the video for three important announcements! Subscribe to the Data School email newsletter: http://www.dataschool.io/subscribe/ Join "Data School Insiders" for exclusive rewards: https://www.patreon.com/dataschool == DATA SCHOOL VIDEO TUTORIALS == Data analysis with pandas (30 videos): https://www.youtube.com/playlist?list=PL5-da3qGB5ICCsgW1MxlZ0Hq8LL5U3u9y Machine learning with scikit-learn (10 videos): https://www.youtube.com/playlist?list=PL5-da3qGB5ICeMbQuqbbCOQWcS6OYBr5A Version control with Git and GitHub (11 videos): https://www.youtube.com/playlist?list=PL5-da3qGB5IBLMp7LtN8Nc3Efd4hJq0kD == PANDAS RESOURCES == GitHub repository for the series: https://github.com/justmarkham/pandas-videos Series "map" documentation: http://pandas.pydata.org/pandas-docs/stable/generated/pandas.Series.map.html Series "apply" documentation: http://pandas.pydata.org/pandas-docs/stable/generated/pandas.Series.apply.html DataFrame "apply" documentation: http://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.apply.html DataFrame "applymap" documentation: http://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.applymap.html == RELATED PANDAS VIDEOS == loc, iloc, and ix: https://www.youtube.com/watch?v=xvpNA7bC8cs&list=PL5-da3qGB5ICCsgW1MxlZ0Hq8LL5U3u9y&index=19 string methods: https://www.youtube.com/watch?v=bofaC0IckHo&list=PL5-da3qGB5ICCsgW1MxlZ0Hq8LL5U3u9y&index=12 == JOIN THE DATA SCHOOL COMMUNITY == Blog: http://www.dataschool.io Newsletter: http://www.dataschool.io/subscribe/ Twitter: https://twitter.com/justmarkham Facebook: https://www.facebook.com/DataScienceSchool/ YouTube: https://www.youtube.com/user/dataschool?sub_confirmation=1