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[英]python remove the last line from the written file with file.write
[英]Python Only last line is written to file
當我執行打印時,將顯示所有文本,但是當寫入文件時,僅寫入最后一步。
import json, urllib
from urllib import urlencode
import googlemaps
start = "Bridgewater, Sa, Australia"
finish = "Stirling, SA, Australia"
url = 'http://maps.googleapis.com/maps/api/directions/json?%s' % urlencode((
('origin', start),
('destination', finish)
))
ur = urllib.urlopen(url)
result = json.load(ur)
for i in range (0, len (result['routes'][0]['legs'][0]['steps'])):
j = result['routes'][0]['legs'][0]['steps'][i]['html_instructions']
print j
output = open("output.html", "w")
output.write(j)
output.close()
我也嘗試過
output.write("%s\n" % j)
我得到一個錯誤,
output.write(result['routes'][0]['legs'][0]['steps'][i]['html_instructions'])
僅顯示最后一步
我想念什么?
那是因為您正在for循環之外寫入文件,所以j
僅包含最后一次迭代的值,因此您只將最后一行寫入文件。
您應該改為在循環之前打開文件,然后在循環內部寫入文件,也可以with
語句一起使用來打開文件,以便自動處理關閉操作。 范例-
with open("output.html", "w") as output:
for i in range (0, len (result['routes'][0]['legs'][0]['steps'])):
j = result['routes'][0]['legs'][0]['steps'][i]['html_instructions']
print j
output.write(j + '\n')
您只寫最后一行,因為寫操作在for循環之外:
with open("output.html", "w") as output:
for step in result['routes'][0]['legs'][0]['steps']:
print step['html_instructions']
output.write(step['html_instructions']+'\n')
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