Python腳本寫入文件在某一點之后停止

Question

我正在嘗試分析sqlite3文件並將結果打印到文本文件中。 如果我用打印測試代碼一切正常。 當我把它寫入文件時，它每次都在同一點切出。

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，打印結果會給出正確的結果，但導出到文件會在URL的中間停止。

Answer 1

好的，我會先用下面的那個替換for循環

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)   

通過使用“with”語句（上下文管理器），我們消除了關閉文件的需要。 通過使用try / except我們捕獲錯誤並打印它。 這將顯示您的代碼失敗的原因以及原因。