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My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? However, if the key is not found when you use dict [key] it assigns NaN. How to follow the signal when reading the schematic? Specifically, you'll see how to apply an IF condition for: Set of numbers Set of numbers and lambda Strings Strings and lambda OR condition Applying an IF condition in Pandas DataFrame Let's now review the following 5 cases: (1) IF condition - Set of numbers To learn more, see our tips on writing great answers. Pandas: Extract Column Value Based on Another Column Can you please see the sample code and data below and suggest improvements? document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Statology is a site that makes learning statistics easy by explaining topics in simple and straightforward ways. Deleting DataFrame row in Pandas based on column value, Create new column based on values from other columns / apply a function of multiple columns, row-wise in Pandas, create new pandas dataframe column based on if-else condition with a lookup. The following code shows how to create a new column called 'assist_more' where the value is: 'Yes' if assists > rebounds. Get started with our course today. I'm an old SAS user learning Python, and there's definitely a learning curve! Otherwise, it takes the same value as in the price column. Cookie information is stored in your browser and performs functions such as recognising you when you return to our website and helping our team to understand which sections of the website you find most interesting and useful. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Do I need a thermal expansion tank if I already have a pressure tank? Why are physically impossible and logically impossible concepts considered separate in terms of probability? I also updated the perfplot benchmark in cs95's answer to compare how the mask method performs compared to the other methods: 1: The benchmark result that compares mask with loc. Now, we can use this to answer more questions about our data set. One sure take away from here, however, is that list comprehensions are pretty competitivethey're implemented in C and are highly optimised for performance. 0: DataFrame. What is the point of Thrower's Bandolier? What is the most efficient way to update the values of the columns feat and another_feat where the stream is number 2? We can see that our dataset contains a bit of information about each tweet, including: We can also see that the photos data is formatted a bit oddly. Python3 import pandas as pd df = pd.DataFrame ( {'Date': ['10/2/2011', '11/2/2011', '12/2/2011', '13/2/2011'], 'Product': ['Umbrella', 'Mattress', 'Badminton', 'Shuttle'], By using our site, you List comprehension is mostly faster than other methods. A place where magic is studied and practiced? #define function for classifying players based on points, #create new column 'Good' using the function above, How to Add Error Bars to Charts in Python, How to Add an Empty Column to a Pandas DataFrame. Using Kolmogorov complexity to measure difficulty of problems? Thanks for contributing an answer to Stack Overflow! Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, You could just define a function and pass this to.