0
我有一個停靠公共交通站點的字典。我想複製那些正在傳輸的文件（有多個行），以便每個附加行都有一個停止複製停止。我最初將這些副本存儲在一個名爲duplicates的字典中。但是，在將相應行的名稱分配給每個複製停止位後，它們都會被原始停止位的原始行列表中的最後一行覆蓋。所以我最終得到了一堆重複的站點，所有站點都有相同的線路，而不是每個線路一站。什麼是壓倒這些價值？文件l_stops.csv在Dropbox和bpaste上。爲什麼在此循環結束時字典值被覆蓋？
import csv
import random
def stop_coords():
with open('l_stops.csv', 'rb') as csvfile:
stop_reader = csv.reader(csvfile, delimiter=',', quotechar='"')
stops = {}
for row in stop_reader:
map_id = row[5]
lines = set()
if row[7] == 'true':
lines.add('Red')
if row[8] == 'true':
lines.add('Blue')
if row[9] == 'true':
lines.add('Green')
if row[10] == 'true':
lines.add('Brown')
if row[11] == 'true':
lines.add('Purple')
if row[13] == 'true':
lines.add('Yellow')
if row[14] == 'true':
lines.add('Pink')
if row[15] == 'true':
lines.add('Orange')
if map_id not in stops:
stop_name = row[2].partition('(')[0].rstrip(' ')
lat = float(row[16].lstrip('"(').rpartition(',')[0])
lng = float(row[16].lstrip('"(').rpartition(',')[2].strip(')"'))
stop = {}
stop['name'] = stop_name
stop['lat'] = lat
stop['lng'] = lng
stop['x'] = lng
stop['y'] = lat
stop['lines'] = lines
stops[map_id] = stop
stop['duplicateStops'] = []
elif stops[map_id]['lines'] != lines:
stops[map_id]['lines'] = stops[map_id]['lines'].union(lines)
for item in stops:
stops[item]['lines'] = list(stops[item]['lines'])
# Add duplicate stops for stops that are transfers (shared by multiple lines)
duplicates = {} # the dictionary that will hold the duplicates and be added to the stops dictionary after all duplicate stops have been processed
for item in stops:
num_lines = len(stops[item]['lines'])
if num_lines > 1: # if a stop has more than one line
original_lines = stops[item]['lines']
stops[item]['lines'] = original_lines[0]
equivalent_map_ids = [item] # Make a list of different map_ids that represent the same stop (but on different lines). The first map_id in the list will be the "original" one.
for i in range(num_lines - 1): # for each line after the first one
# Create a new map_id and make sure it doesn't conflict with an existing map_id
while True:
new_map_id = str(random.randint(10000, 99999))
if new_map_id not in stops and new_map_id not in duplicates:
break
duplicates[new_map_id] = stops[item] # duplicate the stop
equivalent_map_ids.append(new_map_id) # add the new map_id to the list of equivalent map_ids
# Set the duplicateStops value of everyone in equivalent_map_ids's to the other stops' map_ids
# The first map_id in equivalent_map_ids is the original one that's in the stops dictionary, so set its duplicateStops value to the rest of the list
stops[item]['duplicateStops'] = equivalent_map_ids[1:]
# For the rest of the map_ids in equivalent_map_ids
j = 1
for duplicate_stop in stops[item]['duplicateStops']:
duplicates[duplicate_stop]['lines'] = original_lines[j]
duplicates[duplicate_stop]['duplicateStops'] = equivalent_map_ids[:j] + equivalent_map_ids[(j + 1):] # this line also changes stops[item]['duplicateStops'], not sure how
j+= 1
# somehow by this point all duplicates have the same line (the last line in the original 'lines' list)
for stop in stops[item]['duplicateStops']:
print duplicates[stop]['name']
print duplicates[stop]['lines']
for item in duplicates:
print item
print duplicates[item]['name']
print duplicates[item]['lines']
stops.update(duplicates)
stops['none'] = {'name' : 'none', 'lat' : 0, 'lng' : 0, 'x' : 0, 'y' : 0, 'lines' : ['none']}
調試時，我發現，重新分配重複[duplicate_stop] [ 'duplicateStops']也重新分配停止[項目] [ 'duplicateStops']。這怎麼可能？重複和停止是兩個單獨的詞典。