即使输出与原始输出相同,代码也会保存文档?

时间:2013-11-05 17:38:54

标签: python python-2.7 csv if-statement for-loop

在我的下面的代码中,由于某种原因,即使我的输出数据与新生成的数据相同,它也会继续将输出数据写入文件...

我正在努力使它只在不同时保存,为了重新创建我的问题,至少运行三次脚本并且不应该多次打印again

代码示例

import csv

def get_html_table(data):
    s = """<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Title</title>
</head>
    <body>
        <table id="gradient-style">
            <tbody>\n"""
    for row in data:
        s += '        <tr>'
        for counter, cell in enumerate(row):
            s += r'<td>{}</td>'.format(cell)
        s += '</tr>\n'
    s += """            </tbody>
        </table>
    </body>
</html>"""
    return s


with open('testoutput.html', 'rb') as old_html:
    old_html = old_html.read()

identifyer = ""
with open('random.csv') as ifile, open('testoutput.html', 'wb') as ofile:
    data = []

    for counter, row in enumerate(csv.reader(ifile)):
        if counter != 0:
            datatoapp = [row[0], row[1], row[2], row[3]]
            data.append(datatoapp)

    html_data = get_html_table(data)
    old_html = old_html.strip()
    html_data = html_data.strip()

    if old_html != html_data.strip():
        if html_data:
            print "again"
            ofile.write(html_data)

print "done"

正如您所看到的,上面的代码将csv转换为html形式,不包含任何数据。

random.csv

data,data,data,data,data
data,data,data,data,data
data,data,data,data,data
data,data,data,data,data
data,data,data,data,data

任何想法如何解决这个问题?

2 个答案:

答案 0 :(得分:1)

这是因为你打开文件然后进行比较,因为它是相同的,它不会在文件中保存任何内容。

比较例如底部代码部分后打开文件:

import csv

def get_html_table(data):
    s = """<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Title</title>
</head>
    <body>
        <table id="gradient-style">
            <tbody>\n"""
    for row in data:
        s += '        <tr>'
        for counter, cell in enumerate(row):
            s += r'<td>{}</td>'.format(cell)
        s += '</tr>\n'
    s += """            </tbody>
        </table>
    </body>
</html>"""
    return s

with open('testoutput.html', 'rb') as old_html:
    old_html = old_html.read()

with open('random.csv') as ifile:
    data = []

    for counter, row in enumerate(csv.reader(ifile)):
        if counter != 0:
            datatoapp = [row[0], row[1], row[2], row[3]]
            data.append(datatoapp)    

    html_data = get_html_table(data)

if old_html != html_data:
    if html_data:
        with open('testoutput.html', "wb") as ofile:
            ofile.write(html_data)

希望这会有所帮助:) - Hyflex

答案 1 :(得分:-1)

以下内容读取整个文件,而您可能只想阅读一行:

old_html = old_html.read()

P.S。我个人认为这种变量名称的重用非常混乱。