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我有一个 7 列 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，然后将包含更改的整个 CSV 文件写入新的 CSV 文件 (students.csv)。

这是我到目前为止所拥有的，但它并没有遍历整个专栏：

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()
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1 回答 1

2

这是代码：

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：

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

那应该是你想要的一切。

于 2013-10-26T19:05:24.533 回答