Question

我收到此错误：

  File "/DateDbLoop.py", line 33  
    d.Id""" % (str(day), str(2840))"  
    ^  
SyntaxError: EOL while scanning single-quoted string

这是脚本。有4个双引号可以打开这个，但我不确定如何正确关闭它？

跟进问题：

这个％（str（day），str（2840））是否需要同时进入sql变量和os.system（）调用？

#!/usr/bin/python

import datetime
import sys, os, time, string

a = datetime.date(2009, 1, 1)
b = datetime.date(2009, 2, 1)
one_day = datetime.timedelta(1)

day = a

while day <= b:

    print "Running query for \"" + str(day) + "\""

    sql=""""SELECT
        d.Date,  
        SUM(d.Revenue),  
        FROM Table d  
        WHERE d.Date = '%s'  
        AND d.Id = %s  
        GROUP BY d.Date  
        """ % (str(day), str(2840))"

    os.system('mysql -h -sN -u  -p -e %s > FileName-%s.txt db' % (sql, str(day)))
    day += one_day

Answer 1

你的sql = line有4个双引号，而不是3。同时删除％-substitution值后的单引号。

#!/usr/bin/python

import datetime
import sys, os, time, string

a = datetime.date(2009, 1, 1)
b = datetime.date(2009, 2, 1)
one_day = datetime.timedelta(1)

day = a

while day <= b:
    print "Running query for \"" + str(day) + "\""

    sql="""SELECT
    d.Date,  
    SUM(d.Revenue)
    FROM Table d  
    WHERE d.Date = '%s'  
    AND d.Id = %s  
    GROUP BY d.Date  
    """ % (str(day), str(2840))

    os.system('mysql -h -sN -u  -p -e "%s" > FileName-%s.txt db' % (sql, str(day)))
    day += one_day

多行字符串值是在Python中使用双引号的成对三元组完成的，不要嵌套在常规双引号内。

Answer 2

用三个引号打开和关闭字符串

sql = """
      SELECT d.Date, SUM(d.Revenue),
      FROM Table d WHERE d.Date = '%s' AND d.Id = %s 
      GROUP BY d.Date
      """ % (str(day), str(2840))

您还可以使用\字符在字符串中间打破一行。

#!/usr/bin/python

import datetime
import sys, os, time, string

a = datetime.date(2009, 1, 1)
b = datetime.date(2009, 2, 1)
one_day = datetime.timedelta(1)

day = a

while day <= b:

 print "Running query for \"" + str(day) + "\""

 sql="SELECT d.Date, SUM(d.Revenue), FROM Table d WHERE d.Date = '%s' \
      AND d.Id = %s GROUP BY d.Date " % (str(day), str(2840))

 os.system('mysql -h -sN -u  -p -e %s > FileName-%s.txt db' % (sql, str(day)))

Answer 3

您可以使用三重引号。

s = """
Python is awesome.
Python is cool.
I use Python.
And so should you.
"""

print s

Python is awesome.
Python is cool.
I use Python.
And so should you.

我应该如何关闭Python中的多行变量/注释？

3 个答案: