Question

我有一个包含以下数据的CSV文件：

move_pages()

我已像这样将文件导入python：

Date,Profit/Losses
Jan-10,867884
Feb-10,984655
Mar-10,322013
Apr-10,-69417
May-10,310503
Jun-10,522857
Jul-10,1033096
Aug-10,604885
Sep-10,-216386
Oct-10,477532
Nov-10,893810
Dec-10,-80353

我需要遍历这些行，以便仅提取月份（即“ Jan”，“ Feb”等）并将其放在其他列表中。我还必须以某种方式跳过第一行，即with open(csvpath, 'r', errors='ignore') as fileHandle: lines = fileHandle.read()，它是标题。

这是我到目前为止编写的代码：

Date, Profit/Losses

但是，当我尝试打印months = [] for line in lines: months.append(line.split("-")列表时，它会分割文件中的每个字符！我在哪里错了？

Answer 1

您的问题的一个答案是使用fileHandle.readlines()。

lines = fileHandle.readlines()
# print(lines)
# ['Date,Profit/Losses\n', 'Jan-10,867884\n', 'Feb-10,984655\n', 'Mar-10,322013\n',
#  'Apr-10,-69417\n', 'May-10,310503\n', 'Jun-10,522857\n', 'Jul-10,1033096\n', 'Aug-10,604885\n',
#  'Sep-10,-216386\n', 'Oct-10,477532\n', 'Nov-10,893810\n', 'Dec-10,-80353\n']

for line in lines[1:]:
    # Starting from 2nd item in the list since you just want months
    months.append(line.split("-")[0])

Answer 2

您几乎可以始终使用专用工具（例如csv模块和列表理解）来减轻痛苦：

import csv
with open("yourfile.csv") as infile:
    reader = csv.reader(infile) # Create a new reader
    next(reader) # Skip the first row
    months = [row[0].split("-")[0] for row in reader]

Answer 3

如果您真的想用困难的方式尝试它，请尝试以下操作：

$(document).ready(function() {
  var barStyle = {
    scaleLineColor: "rgba(0,0,0,0)",
    scaleShowLabels: true,
    scaleShowGridLines: false,
    pointDot: false,
    datasetFill: false,
    // Sadly if you set scaleFontSize to 0, chartjs crashes
    // Instead we'll set it as small as possible and make it transparent
    scaleFontSize: 9,
  };

  $(".barchart").each(function() {
    //Get context with jQuery - using jQuery's .get() method.
    var ctx = $(this)
      .get(0)
      .getContext("2d");
    //This will get the first returned node in the jQuery collection.
    var myNewChart = new Chart(ctx);   
    // Get the chart data and convert it to an array
    var chartData = $(this).data("chart");

    // Build the data object
    var data = {};
    var labels = [];
    var datasets = {};

    // Create a null label for each value
    for (var i = 0; i < chartData.length; i++) {
      labels.push("");
    }

    // Create the dataset
    datasets["strokeColor"] = 'rgba(54, 162, 235, 0.2)';
    datasets["data"] = chartData;    

    // Add to data object
    data["labels"] = $(this).data("label");
    data["datasets"] = Array(datasets);

    new Chart(ctx).Bar(data, barStyle);
  });
});

months = [] for line in lines[1:]: months.append(line.split("-")[0])将跳过第一行，而lines[1:]仅提取月份并追加到您的列表line.split("-")[0]。

但是，按照AChampion的建议，您应该真正研究months或csv软件包。

Answer 4

这应该可以达到预期的效果（假设在同一目录中名为data.csv的文件）：

result = []

with open('data.csv', 'r', encoding='UTF-8') as data:
    next(data)
    for record in data:
        result.append(record.split('-')[0])

python-用分隔符在CSV文件中分割字符串

4 个答案: