python开发_csv(Comma Separated Values)_逗号分隔值_常用导入导

<div class="cnblogs_code">

(Comma Separated Values)，从字面上面理解为：逗号分隔值
    举个例子，如：test_csv = 'one,two,three,4,5'
    对于test_csv这个变量来说，他里面就存放着这样的值：逗号分隔的值。这样的形式
    在导入和导出中非常常见，如python(version:3.3.2)的API中所描述的一样：
    The so-called <a href="http://docs.python.org/3/library/csv.html"&gt;<span style="color: #ff0000;"&gt;<strong>CSV</strong></span></a>(Comma Separated Values) format is the most
    common import and export for spreadsheets and databases.

csv模块定义了以下函数：

    csv.reader(csvfile,dialect = 'excel',**fmtparams)
        Retuen a reader object which will iterate over lines
        in the given csvfile.
A short usage example:
    import csv
    with open('eggs.csv',newline = '') as cf:
        spamreader = csv.reader(cf,delimiter = ' ',quotechar = '|')
        for row in spamreader:
            print(','.join(row))

    csv.write(csvfile,**fmtparams)
        Return a writer object reaponsible for converting the
        user's data into delimited strings on the given file-like
        object.

A short usage example:
    import csv
    with open('eggs.csv','w',newline = '') as cf:
        spamwrite = csv.writer(cf,quotechar = '|',quoting = csv.QUOTE_MINIMAL)
        spamwriter.writerow(['Spam'] * 5 + ['Baked Beans'])
        spamwriter.writerow(['Spam','Lovely Spam','Wonderful Spam'])
<span style="color: #800000;">'''

一下是我做的demo:

目录下面的情况：

（编辑：李大同）

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