To save Pandas dataframe as CSV file, you can use the function of df.to_csv. The following shows the steps. df.to_csv(“file_name.csv”) Step 1: Dataframe example The following Python code is to generate the sample dataframe. The following is the print out of the generated sample dataframe. df_1: Brand Location a Tesla CA b Toyota CA c … Read more
Introduction There are two methods to left join two dataframes in Pandas. Method 1 We can use how=’left’ tells join() to left join two dataframes. df_1.join(df_2, how=’left’) Method 2 We can use how=’left’ tells merge() to left join two dataframes. df_1.merge(df_2, how=’left’, left_index=True,right_index=True) Sample Data The following is the two dataframes to be left joined. … Read more
Method 1 Use merge() to merge two dataframes in Pandas based on a column. When the column name is the same in both dataframes, we can use the following statement to merge two dataframes based on that column. col_name is the name of the common column in df_1 and df_2. df_1.merge(df_2, on=”col_name”) The following is … Read more
There are two methods to join two dataframes in Pandas based on a column. (Note that, by default, join() will use index to combine two dataframes.) Method 1: We can use a combination of set_index(‘col_name’) and on=’col_name’ for df_2. col_name is a common column in both df_1 and df_2. df_1.join(df_2.set_index(‘col_name’),on=’col_name’) Method 2: We can use … Read more
append() adds rows of other to the end of caller, returning a new object. The following is the basic syntax of append(), in which df_1 is the main one, and df_2 will be appended into df_1. df_1.append(df_2) The following is the dataframes that will be used later in the examples. df_1: Brand Location a Tesla CA b … Read more
This tutorial shows example how of merge dataframes in Pandas Python. In particular, merge() can be used to merge two dataframes. The basic syntax is as follows. merge(df_1,df_2, left_index=True, right_index=True) Below is the two dataframes to be merged. dataframe 1: car_location : Brand Location a Tesla CA b Toyota CA c Tesla NY d Ford … Read more
We can use join() to combine dataframes in Python Pandas. The basic syntax is as follows, in which df_1 and df_2 represent two dataframes to be joined. df_1.join(df_2) The following includes examples showing how to join two dataframes using join(). Below is the two dataframes. dataframe 1: car_data: Brand Location a Tesla CA b Toyota CA … Read more
import pandas as pd serves two functions. First, import pandas tells Python to import the pandas library into the current programming environment. Second, as pd tells Python that you want to give a nickname pd for pandas. That is, pd will be alias for pandas. Example 1: Use import pandas as pd Brand Count 0 … Read more
This tutorial shows how can you upload CSV file to Github. It includes detailed steps and examples. Step 1: Create a new repository A new repository is where CSV files will be stored. Below. I created one and name it as machine_learning (Click here for the link.). Then, just hit the botton of Create repository. … Read more
There are at least 3 methods to select 2 or more than 2 columns from a dataframe in Python. Method 1: Use a list of column names df[ [ “col1”, “col2” ] ] Method 2: Use a range of column index df.iloc [ : , 0 : 2 ] Method 3: Use specific column indexes … Read more