Question

我有一个包含7列和20行的CSV文件（students_temp.csv）：

Name,Age,Gender,Varsity,GPA,Town,State
John,18,Male,yes,3.2,Tacoma,WA
Tyler,18,Male,yes,2.9,Tacoma,WA
Jane,17,Jane,yes,3.5,Tacoma,WA
Michelle,18,Female,no,3.1,Tacoma,WA
Jamie,17,Male,no,2.6,Tacoma,WA
Robert,17,Male,yes,4.0,Tacoma,WA
Danielle,18,Female,no,3.0,Tacoma,WA
Dustin,18,Male,no,3.2,Tacoma,WA
Angela,16,Female,no,2.9,Tacoma,WA
Barbara,17,Female,yes,3.5,Tacoma,WA
Megan,18,Female,no,3.4,Tacoma,WA
Michael,18,Male,yes,3.0,Tacoma,WA
Craig,17,Male,no,3.1,Tacoma,WA
Jackson,18,Male,no,2.8,Tacoma,WA
Bill,18,Male,yes,3.2,Tacoma,WA
Matthew,17,Male,yes,3.0,Tacoma,WA
Karen,16,Female,no,3.4,Tacoma,WA
Sarah,17,Female,yes,3.2,Tacoma,WA
Charles,18,Male,no,3.5,Tacoma,WA

我想读取该文件，解析Varsity列并将该列中的所有内容更改为大写，然后将包含的更改写入整个CSV文件到新的CSV文件（students.csv）。

这是我到目前为止的内容，但它并没有遍及整个专栏：

import csv

input_file = csv.DictReader(open('students_temp.csv', 'rb'))

for row in input_file:
    varsity_col = str(row['Varsity'])
    varsity_col.upper()

print varsity_col.upper()

Answer 1

以下是代码：

with open("/path/to/new/file", "w") as newfile:   # Create and open the new file
    with open("/path/to/old/file") as oldfile:    # Open the old file
        oldfile = oldfile.readlines()             # Read the lines of the old file into a list
        newfile.write(oldfile[0])                 # Write the column names to the new file
        for line in oldfile[1:]:                  # Iterate through the lines, skipping the first (which we already wrote to the new file)
            line = line.split(",")                # Split the line by commas
            line[3] = line[3].upper()             # Make the Varsity column value uppercase
            newfile.write(",".join(line))         # Put the line back together with .join and write it to the new file

新文件的样子如下：

Name,Age,Gender,Varsity,GPA,Town,State
John,18,Male,YES,3.2,Tacoma,WA
Tyler,18,Male,YES,2.9,Tacoma,WA
Jane,17,Jane,YES,3.5,Tacoma,WA
Michelle,18,Female,NO,3.1,Tacoma,WA
Jamie,17,Male,NO,2.6,Tacoma,WA
Robert,17,Male,YES,4.0,Tacoma,WA
Danielle,18,Female,NO,3.0,Tacoma,WA
Dustin,18,Male,NO,3.2,Tacoma,WA
Angela,16,Female,NO,2.9,Tacoma,WA
Barbara,17,Female,YES,3.5,Tacoma,WA
Megan,18,Female,NO,3.4,Tacoma,WA
Michael,18,Male,YES,3.0,Tacoma,WA
Craig,17,Male,NO,3.1,Tacoma,WA
Jackson,18,Male,NO,2.8,Tacoma,WA
Bill,18,Male,YES,3.2,Tacoma,WA
Matthew,17,Male,YES,3.0,Tacoma,WA
Karen,16,Female,NO,3.4,Tacoma,WA
Sarah,17,Female,YES,3.2,Tacoma,WA
Charles,18,Male,NO,3.5,Tacoma,WA

这应该是你想要的一切。

更改CSV并写入新文件

1 个答案: