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python - Python脚本写入文件在某个点后停止

问题描述

我正在尝试分析 sqlite3 文件并将结果打印到文本文件中。如果我用 print 测试代码，一切正常。当我将它写入文件时，它每次都会在同一点切断。

import sqlite3
import datetime
import time


conn = sqlite3.connect("History.sqlite")
curs = conn.cursor()
results = curs.execute("SELECT visits.id, visits.visit_time, urls.url, urls.visit_count \
                                        FROM visits INNER JOIN urls ON urls.id = visits.url \
                                        ORDER BY visits.id;")
exportfile = open('chrome_report.txt', 'w')


for row in results:
    timestamp = row[1]
    epoch_start = datetime.datetime(1601,1,1)
    delta = datetime.timedelta(microseconds=int(timestamp))
    fulltime = epoch_start + delta
    string = str(fulltime)
    timeprint = string[:19]
    exportfile.write("ID: " + str(row[0]) + "\t")
    exportfile.write("visit time: " + str(timeprint) + "\t")
    exportfile.write("Url: " + str(row[2]) + "\t")
    exportfile.write("Visit count: " + str(row[3]))
    exportfile.write("\n")
    print "ID: " + str(row[0]) + "\t"
    print "visit time: " + str(timeprint) + "\t"
    print "Url: " + str(row[2]) + "\t"
    print "Visit count: " + str(row[3])
    print "\n"   
conn.close()

因此打印结果给出了正确的结果，但导出到文件的过程在 url 中间停止。

标签： pythonsqlite

解决方案

好的，我首先将 for 循环替换为下面的循环

with open('chrome_report.txt', 'w') as exportfile:
    for row in results:
        try:
            timestamp = row[1]
            epoch_start = datetime.datetime(1601,1,1)
            delta = datetime.timedelta(microseconds=int(timestamp))
            fulltime = epoch_start + delta
            string = str(fulltime)
            timeprint = string[:19]
            exportfile.write("ID: " + str(row[0]) + "\t")
            exportfile.write("visit time: " + str(timeprint) + "\t")
            exportfile.write("Url: " + str(row[2]) + "\t")
            exportfile.write("Visit count: " + str(row[3]))
            exportfile.write("\n")
            print "ID: " + str(row[0]) + "\t"
            print "visit time: " + str(timeprint) + "\t"
            print "Url: " + str(row[2]) + "\t"
            print "Visit count: " + str(row[3])
            print "\n"
        except Exception as err:
            print(err)

通过使用“with”语句（上下文管理器），我们无需关闭文件。通过使用 try/except 我们捕获错误并打印它。这将向您展示您的代码在哪里失败以及原因。

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