How to read random lines from a csv file in python?

How to read random lines from a csv file in python?

“Python program to read a random line from a file.” Code Answer

1. import random.
2. def randnum(fname):
3. lines=open(fname). read(). splitlines()
4. print(lines)
5. return random. choice(lines)
6. ​
7. print(randnum(‘file1.txt’))

How do I read a text file as CSV?

How to Convert a TXT file to CSV

1. Open Excel and create a new spreadsheet.
2. Select the Data tab.
3. On the far right, click “Get External Data”, then select the “From Text” option.
4. Find the TXT file on your computer and click “Open”.
5. In the first step of the Import Wizard, select “Delimited”.

Can a TXT file be CSV?

Converting a TXT file into a CSV file doesn’t have to be a difficult process. You can use popular software packages such as Microsoft Excel to format your text file and then quickly convert it into the CSV file format.

How do you generate a random line from a list in Python?

Python

1. Open the file in read mode using with function.
2. Store all data from the file in a string and split the string into words.
3. Count the total number of words.
4. Use random. randint() to generate a random number between 0 and the word_count.
5. Print the word at that position.

How do I save a text file as comma delimited?

Go to File > Save As. Click Browse. In the Save As dialog box, under Save as type box, choose the text file format for the worksheet; for example, click Text (Tab delimited) or CSV (Comma delimited).

Is there any way to read random lines from a CSV file?

It’s very memory consuming to read the all file into memory to use some random choosing and it’s very time consuming to go trough all the file and discard some values and choose others, so, is there anyway to choose some random line from the CSV file and read only that line?

How to read a CSV file with pandas?

Assuming a header on the first row: import pandas as pd import random p = 0.01 # 1% of the lines # keep the header, then take only 1% of lines # if random from [0,1] interval is greater than 0.01 the row will be skipped df = pd.read_csv ( filename, header=0, skiprows=lambda i: i>0 and random.random () > p )

How to get a random line in Python?

Recently I wrote a python package called linereader, which allows you to manipulate the pointers of file handles. Here is the simple solution to getting a random line with this package: The first time this is done is the worst, as linereader has to compile the output file in a special format.

How to read the header of a CSV file?

The following code reads first the header, and then a random sample on the other lines: