如何读取csv文件中的数据并打印特定的文件？

Question

在我的程序中，我要求用户输入数字，然后继续使用DictReader读取csv文件。 我想在csv文件中输出比用户数大的值。

import csv

limit_amount = raw_input("Please Enter a Limit Amount: ")

with open("transactionsample.csv","rb") as my_file:
    reader = csv.DictReader(my_file)
    for row in reader:
        print row

Answer 1

import csv

limit_amount = int(raw_input("Please Enter a Limit Amount: ")) #convert limit_amount from string to int

with open("transactionsample.csv") as my_file: #rb is really unnecessary
    reader = csv.DictReader(my_file)
    for row in reader:
        for k in row: #check each cell
            if row[k].isdigit() and int(row[k]) > limit_amount: #validation and comparison 
                print row[k]

Answer 2

您要做的是对照用户输入limit_amount测试您正在读取的row的值。 为此，您需要知道要将用户输入与哪个“列”进行比较，假设您要查找的值位于索引2 ：

import csv

limit_amount = raw_input("Please Enter a Limit Amount: ")

with open("transactionsample.csv","rb") as my_file:
    reader = csv.DictReader(my_file)
    for row in reader:
        if row[2] >= limit_amount: # you might have to change the if condition to match exactly what you want
            print row