Tag: into
How to convert a HashSet into an array in Java
In this article we will discuss how to convert a HashSet in to an array. Each collection that provides a member function toArray() i.e. Advertisements public <T> T[] toArray(T[] a) It iterates through all the elements of Collection (HashSet in our case) and set the each elements in the passed argument array []a. But if array …
C++ : How to read a file line by line into a vector ?
In this article we will discuss how to read a file line by line and put them in a vector or perform some other operation each line. Reading File line by line First open the file i.e. Advertisements // Open the File std::ifstream in(“file.txt”); Now keep reading next line using getline() and push it in …
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Pandas : Convert Dataframe column into an index using set_index() in Python
In this article, we will discuss that in pandas, how to convert an existing column of a Dataframe to an index, and also various scenarios associated with it. Pandas Dataframe class provides a function set_index (). Let’s first have a look at that, Advertisements DataFrame.set_index() DataFrame.set_index(self, keys, drop=True, append=False, inplace=False, verify_integrity=False) It accepts column names in the keys argument and …
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Pandas : Convert Dataframe index into column using dataframe.reset_index() in python
In this article, we will discuss how to convert indexes of a dataframe or a multi-index dataframe into its columns. Pandas Dataframe class provides a function to reset the indexes of the dataframe i.e. Dataframe.reset_index() DataFrame.reset_index(self, level=None, drop=False, inplace=False, col_level=0, col_fill=”) It resets the indexes of the dataframe and returns a dataframe with a new index.Important arguments are as follows, …
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Pandas : Convert a DataFrame into a list of rows or columns in python | (list of lists)
In this article, we will discuss how to convert a dataframe into a list of lists, by converting either each row or column into a list and create a python list of lists from them. First of all, create a dataframe, Advertisements import pandas as pd # List of Tuples students = [(‘jack’, 34, ‘Sydney’, …
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Pandas: Convert a dataframe column into a list using Series.to_list() or numpy.ndarray.tolist() in python
In this article, we will discuss different ways to convert a dataframe column into a list. Fits of all, create a dataframe object that we are going to use in this example, Advertisements import pandas as pd # List of Tuples students = [(‘jack’, 34, ‘Sydney’, 155), (‘Riti’, 31, ‘Delhi’, 177.5), (‘Aadi’, 16, ‘Mumbai’, 81), …
Python: Read CSV into a list of lists or tuples or dictionaries | Import csv to list
In this article we will discuss how to import a CSV into list. This list can be a list of lists, list of tuples or list of dictionaries. We will also use pandas module and cover scenarios for importing CSV contents to list with or without headers. Suppose we have a CSV file ‘students.csv’ and …
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Pandas: Add two columns into a new column in Dataframe
In this article we will discuss different techniques to sum values of two columns in a dataframe and assign summed values as a new column. We will also cover the scenarios where columns contain NaN values. Suppose we have a Dataframe which contains employee name as an index and each column contains their monthly salaries, …
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MYSQL INSERT INTO
INSERT keyword in MYSQL is used to add the data to tables, specifically new rows. In this article, we will be talking about how to insert records in the tables. Table of Contents MYSQL INSERT INTO TABLE INSERTING MULTIPLE ROWS IN MYSQL MYSQL INSERT INTO SPECIFIC COLUMNS MYSQL INSERT INTO TABLE This is the most …
Insert into a MySQL table or update if exists
While inserting rows into a table, there are times when the requirement is to insert the rows into a table, but if the key already exists, then update the value. This concept is also known as UPSERT, which is combining UPDATE with INSERT. In this article, we will be looking into : Insert or Update …