如何使用Python下载和重写文件？

FrankC 发表于 Dev

弗兰克·C

我不希望它像现在这样用日期更改名称，而是要下载文件“ finviz.csv”并每天（使用调度程序任务）重写它，以使数据在我的数据系统中保持更新。

我尝试了一些调整，但是我不是开发人员，我不知道如何执行此操作。你能帮忙吗？

颜菲利

代码中的注释非常清楚地描述了它：

# we're going to name the file by the date it was downloaded (e.g. 2012-3-18.csv)
fname = now.strftime("%Y-%m-%d")+".csv";

因此，只需将行更改为

fname = "finviz.csv";

并修复文件存在检查逻辑：

# check if the file does not already exist
if not os.path.isfile(savepath+"/"+fname):
    # open a file to save the data to ("wb" means write binary mode)
    outfile = open(savepath+"/"+fname, "wb");
    # download the data from the url specified above
    infile = urllib2.urlopen(url);
    # read the downloaded data and write it to our output file
    outfile.write(infile.read());
    # close the output file once we're done
    outfile.close();
else:
    print "'"+fname+"' ALREADY EXISTS in the save directory '"+savepath+"'.";

到：

# open a file to save the data to ("wb" means write binary mode)
outfile = open(savepath+"/"+fname, "wb");
# download the data from the url specified above
infile = urllib2.urlopen(url);
# read the downloaded data and write it to our output file
outfile.write(infile.read());
# close the output file once we're done
outfile.close();

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