Question

我有分析csv文件的代码，并返回列的最大值以及与maxvalue在同一行中的另一列的值。我无法格式化输出。

代码：

import csv

def bigQuake(inputfilename):
    with open(inputfilename,"r") as input_file:
        reader = csv.reader(input_file)

        maxvalue = 0.0
        location = None
        for line in reader:
            try:
                p = float(line[4])
                if p > maxvalue:
                    maxvalue = p
                    location = line[13]
            except ValueError:
               pass
    return "The largest earthquake was a", maxvalue, "magnitude earthquake", location + "."

当前的输出结果如何：

>>> bigQuake("file.csv")
>>> ('The largest earthquake was a', 6.3, 'magnitude earthquake', '13km N of Kunisaki-shi, Japan.')

我想要的是什么：

>>> bigQuake("file.csv")
>>> 'The largest earthquake was a 6.3 magnitude earthquake 13km N of Kunisaki-shi, Japan.'

我该如何解决这个问题？

Answer 1

使用此，

return "The largest earthquake was a" + str(maxvalue) + "magnitude earthquake" + location + "."

OR

return "The largest earthquake was a %s magnitude earthquake %s." % (maxvalue, location)

Answer 2

您可以使用+进行连接并返回连接字符串：

return "The largest earthquake was a "+ str(maxvalue)+ " magnitude earthquake "+ location + "."

Answer 3

使用format：

>>> maxvalue=6.3
>>> location='13km N of Kunisaki-shi, Japan'
>>> 
>>> template="The largest earthquake was a {} magnitude earthquake, {}."
>>> 
>>> template.format(maxvalue, location)
'The largest earthquake was a 6.3 magnitude earthquake, 13km N of Kunisaki-shi, Japan.'

然后，如果要将该文本放入指定的宽度，请使用textwrap：

>>> import text wrap
>>> print '\n'.join(textwrap.wrap(template.format(maxvalue, location), 30))
The largest earthquake was a
6.3 magnitude earthquake, 13km
N of Kunisaki-shi, Japan.

Answer 4

使用％formatter。例如：

print "I have %d cats" % (3)

将打印＆＃34;我有3只猫＆＃34;。见＆lt; https://docs.python.org/2/library/string.html＆GT;

返回一个字符串，如何格式化输出

4 个答案: