How do I read the second column of a CSV file in Python?

How do I read the second column of a CSV file in Python?

To read a CSV file, call pd. read_csv(file_name, usecols=cols_list) with file_name as the name of the CSV file, delimiter as the delimiter, and cols_list as the list of specific columns to read from the CSV file. Call df[col] with df as the DataFrame from the previous step, and col as the column name to read.

How do I convert a CSV file to a list in Python?

Use csv. reader() to read a . csv file into a list

1. file = open(“sample.csv”, “r”)
2. csv_reader = csv. reader(file)
3. lists_from_csv = []
4. for row in csv_reader:
5. lists_from_csv. append(row)
6. print(lists_from_csv) Each row is a separate list.

How do I iterate through a CSV file in Python?

How did it work ?

1. Open the file ‘students. csv’ in read mode and create a file object.
2. Create a reader object (iterator) by passing file object in csv. reader() function.
3. Now once we have this reader object, which is an iterator, then use this iterator with for loop to read individual rows of the csv as list of values.

How do I turn a column into a list in Python?

Index column can be converted to list, by calling pandas. DataFrame. index which returns the index column as an array and then calling index_column. tolist() which converts index_column into a list.

How do I iterate over rows and columns in pandas?

In order to iterate over rows, we use iteritems() function this function iterates over each column as key, value pair with label as key and column value as a Series object.

How do I read a csv file without header in Python?

Steps to read CSV columns into a list without headers:

1. Import the csv module.
2. Create a reader object (iterator) by passing file object in csv.
3. Call the next() function on this iterator object, which returns the first row of CSV.
4. Store the headers in a separate variable.

How do I read a csv file?

Use csv. reader() to read a line from csv file Call open(file) with file as the csv file name. Call csv. reader(csvfile) to generate an object which will iterate over each line in the given csv file. Pass in the reader object to next(iterator) to get a single line from the csv file.

How do I skip the first row in Python CSV?

Use csv. reader() and next() to skip the first line of a . csv file

1. file = open(‘sample.csv’)
2. csv_reader = csv. reader(file)
3. next(csv_reader)
4. for row in csv_reader:
5. print(row)

How to read CSV columns into a list in Python?

Python – Read CSV Columns Into List 1 Read CSV Columns into List and Print on The Screen In the following Python program, it will read the CSV file using… 2 Read and Print Specific Columns from The CSV Using csv.reader Method In the following example, it will print the… 3 Read CSV via csv.DictReader Method and Print Specific Columns More

How to iterate over a CSV file in Python?

It returned an iterator, which can be used to iterate over all the lines of csv file. But we passed this iterator object to list () function, which return a list of lists i.e. where each list represents a row of csv and each item in the list represents a cell / column in that row.

How to select an element from a CSV file?

We can also select an individual element in csv file by row & column number using this list of lists created above. For example, from the list of lists i.e. list_of_rows (created above), let’s select the value from csv at row number 3 and column number 2, In the previous example, we loaded all rows (including header) into a list of lists.

How to convert a CSV file to a list?

Then to convert from a list of rows to a list of columns, use zip (): Seems like you have OSX line endings in your csv file. Try saving the csv file as “Windows Comma Separated (.csv)” format.