Save results to csv file with Python

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import csv

with open('test.csv', 'rb') as f:
  data = list(csv.reader(f))

import collections
counter = collections.defaultdict(int)
for row in data:
    counter[row[1]] += 1
for row in data:
    if counter[row[1]] >= 4:
      writer = csv.writer(open("test1.csv", "wb"))
      writer.writerows(row)

I am getting strange output! What is wrong with this code?

Use csv.writer:

import csv

with open('thefile.csv', 'rb') as f:
  data = list(csv.reader(f))

import collections
counter = collections.defaultdict(int)
for row in data:
    counter[row[0]] += 1


writer = csv.writer(open("/path/to/my/csv/file", 'w'))
for row in data:
    if counter[row[0]] >= 4:
        writer.writerow(row)

writing the output results on CSV file, python, I reached below list (data list in the end code) after calculation of the hash password from the csv file: ['danial', 5104, 'elham', 9770] and i am. If you'd like to learn more about using CSV files in Python in more detail, you can read more here: Reading and Writing CSV Files in Python. Saving a JSON File. JSON is another popular format for storing data, and just like with CSVs, Python has made it dead simple to write your dictionary data into JSON files:

I know the question is asking about your "csv" package implementation, but for your information, there are options that are much simpler — numpy, for instance.

import numpy as np
np.savetxt('data.csv', (col1_array, col2_array, col3_array), delimiter=',')

(This answer posted 6 years later, for posterity's sake.)

In a different case similar to what you're asking about, say you have two columns like this:

names = ['Player Name', 'Foo', 'Bar']
scores = ['Score', 250, 500]

You could save it like this:

np.savetxt('scores.csv', [p for p in zip(names, scores)], delimiter=',', fmt='%s')

scores.csv would look like this:

Player Name,Score
Foo,250
Bar,500

Reading and Writing CSV Files in Python, csvfile : Any object with a write() method, which in this case is usually a file object to the csv.writer method, although it maps the dictionary to output rows. The code above creates a .CSV with the correct output, but it's writing each character from the API results into a new cell in Column A of the output file. Screenshot below: I've also attempted the code below, which writes the entire API result set into a single cell in the .CSV output file.

You can close files not csv.writer object, it should be:

f = open(fileName, "wb")
writer = csv.writer(f)
String[] entries = "first*second*third".split("*");
writer.writerows(entries)
f.close()

Writing CSV files in Python, For example, you might export the results of a data mining program to a CSV file and then import that into a spreadsheet to analyze the data, generate graphs for  A CSV (comma separated values) file allows data to be saved in a tabular structure with a .csv extension. CSV files have been used extensively in e-commerce applications because they are considered very easy to process. Some of the areas where they have been used include: importing and exporting customer data.

An easy example would be something like:

writer = csv.writer(open("filename.csv", "wb"))
String[] entries = "first#second#third".split("#");
writer.writerows(entries)
writer.close()

Reading and Writing CSV Files in Python – Real Python, Save results to csv file with Python. import csv with open('test.csv', 'rb') as f: data = list(csv.reader(f)) import collections counter = collections.defaultdict(int) for  Read JSON file using Python; Let’s see how to save a Pandas DataFrame as a CSV file using to_csv() method. Example #1: Save csv to working directory. filter_none.

This is how I do it

 import csv
    file = open('???.csv', 'r')
    read = csv.reader(file)
    for column in read:
            file = open('???.csv', 'r')
            read = csv.reader(file)
            file.close()
            file = open('????.csv', 'a', newline='')
            write = csv.writer(file, delimiter = ",")
            write.writerow((, ))
            file.close()

Save results to csv file with Python, Is this the same as making the csv file on Excel, like by changing the save type to excel? Read Duration: 6:13 Posted: 12 Sep 2017 But you also need to parse the incoming CSV data. As it is your code reads each line of the input CSV file as a single string. Then, without splitting that line into its constituent fields, it passes the string to the CSV writer. As a result, the csv.writer will treat the string as a sequence and output each character, including any terminating

Writing CSV Files in Python, The csv module implements classes to read and write tabular data in CSV format. which operates like a regular writer but maps dictionaries onto output rows. CSV files are very easy to work with programmatically. Any language that supports text file input and string manipulation (like Python) can work with CSV files directly. Parsing CSV Files With Python’s Built-in CSV Library. The csv library provides functionality to both read from and write to CSV files. Designed to work out of the box with Excel-generated CSV files, it is easily adapted to work with a variety of CSV formats.

14.1. csv — CSV File Reading and Writing, The CSV format is the most commonly used import and export format for to show you how to read and write data to a CSV file in Python. Finally, we append each row to the results list and print the contents to the console. I have the following Python code which predicts result on the iris dataset in the frame of machine learning. Basically the results are in the 'detailed_result' variable at the end, could you please advise with the syntax how that could be exported as .csv file from Python? You need an Expert Office subscription to comment.

How to Read and Write CSV Files in Python, csvfile = "<path to output csv or txt>" #Assuming res is a flat list with open(csvfile, "​w") as output: writer = csv.writer(output, lineterminator='\n') for val in res:  In addition, many applications, such as Microsoft Excel, Notepad, and Google Docs, can be used to import or export CSV files. The csv Python Module. The csv module implements classes to operate with CSV files. It is focused on the format that is preferred by Microsoft Excel.

Comments
  • docs.python.org/library/csv.html
  • Less than 24 hours ago you accepted the answer that has this link in its content!
  • I posted this before, but you may not have read it. Seriously, since you're just beginning in Python, it might be a good idea to look through a tutorial and learn the basics of the language, rather than try to learn just the features you need and search for the answers on StackOverflow when you can't find something. It'll take more time, sure, but you'll get a MUCH better understanding of the language.
  • See also: How do I read and write CSV files with Python?
  • You can close files not csv.writer object, it should be f = open(fileName, "wb") writer = csv.writer(f) String[] entries = "first#second#third".split("#"); writer.writerows(entries) f.close()
  • The indentation is incorrect and why do you open the same file twice?
  • This is just an exact copy of the accepted answer, but with no explanation and no formatting.