用python读取csv文件

Question

I want to read the last 24 rows of a csv file using python. So for example if the csv Data has 500 rows, I want to write row 476 to row 500. I dont know how many rows the csv file has. I tried this code, doesn't work. Can someone help me?

csvData.readlines()[-24:]
    html.write('{ x: new Date('+ row[0] + '), y:' + row[2] + '},')

Answer 1

csvData.readlines()[-24:]

returns a list of all lines in your file. Appropriate code could be:

for row in csvData.readlines()[-24:]:
    html.write('{ x: new Date('+ row[0] + '), y:' + row[2] + '},')

Answer 2

You need to use a for loop to read the lines. csvData.readlines() returns a list of lines. So, by doing something like below you can achieve what you want:

for row in csvData.readlines()[-n:]: # you can read the last n lines