两个月前开始学习Python，开启和关闭。还是初学者，但我来自坚实的C背景。我可能不会以“Python”的方式做事，因为C对我来说是如此根深蒂固，但我让我的脚本工作。但是，我刚刚添加了一个while循环，以便我可以多次运行它并退出用户请求。然而，无论输入是什么，while循环都会退出。我很确定我的缩进是正确的。这是整个脚本（删除了我的API密钥）。这是外部循环，完成时== 0：
#!/usr/bin/env python3
import sys
import requests
import json
import time
appid = {'key': 'xxxxxxxxxxxxxxx'}
kingston = {'city': "/Canada/Kingston.json", 'city_str': "Kingston, Ontario"}
ottawa = {'city': "/Canada/Ottawa.json", 'city_str': "Ottawa, Ontario"}
toronto = {'city': "/Canada/Toronto.json", 'city_str': "Toronto, Ontario"}
vancouver = {'city': "/Canada/Vancouver.json", 'city_str': "Vancouver, British Columbia"}
sydney = {'city': "/Australia/Sydney.json", 'city_str': "Sydney, Australia"}
wellington = {'city': "/zmw:00000.1.93436.json", 'city_str': "Wellington, New Zealand"}
london = {'city': "/zmw:00000.1.03772.json", 'city_str': "London, UK"}
bergen = {'city': "/zmw:00000.1.01317.json", 'city_str': "Bergen, Norway"}
def cityquery(query):
searchresult = requests.get("http://autocomplete.wunderground.com/aq", params={'query': query})
results = json.loads(searchresult.text)
for index, x in enumerate(results['RESULTS'], start=1):
print(index, x['name'])
selection = input("Please select a number from the list:")
return {'city': results['RESULTS'][int(selection) - 1]['l'] + ".json", 'city_str': results['RESULTS'][int(selection) - 1]['name']}
def getWeather():
finished = 0
while finished == 0:
selected = 0
print("Please choose a city, or enter s to search by city name:")
print("\t1)", toronto['city_str'])
print("\t2)", sydney['city_str'])
print("\t3)", london['city_str'])
print("\t4)", vancouver['city_str'])
print("\t5)", ottawa['city_str'])
print("\t6)", kingston['city_str'])
print("\t7)", wellington['city_str'])
print("\t8)", bergen['city_str'])
while selected == 0:
citynumber = input("Enter a city number or s: ")
if citynumber == '1':
current_city = toronto
selected = 1
elif citynumber == '2':
current_city = sydney
selected = 1
elif citynumber == '3':
current_city = london
selected = 1
elif citynumber == '4':
current_city = vancouver
selected = 1
elif citynumber == '5':
current_city = ottawa
selected = 1
elif citynumber == '6':
current_city = kingston
selected = 1
elif citynumber == '7':
current_city = wellington
selected = 1
elif citynumber == '8':
current_city = bergen
selected = 1
elif citynumber == 's':
searchterm = input("Please type the first few characters of a city name: ")
current_city = cityquery(searchterm)
selected = 1
else:
print("Invalid entry!")
current_time = time.localtime()
print("The current time is", str('{:02d}'.format(current_time[3])) + ":" + str('{:02d}'.format(current_time[4])) + ":" + str('{:02d}'.format(current_time[5])))
print("Forecast for", current_city['city_str'])
#Current conditions
print("Getting current conditions...")
page = requests.get("http://api.wunderground.com/api/" + str(appid['key']) + "/conditions/q/" + current_city['city'])
values = json.loads(page.text)
# DEBUG print(page.text)
# DEBUG print(current_city)
temp = float(values['current_observation']['temp_c'])
if values['current_observation']['windchill_c'] == 'NA':
temp_wc = temp
else:
temp_wc = float(values['current_observation']['windchill_c'])
print("The temperature in", current_city['city_str'], "is currently", str('{:.2f}'.format(temp)) + "C feeling like", str('{:.2f}'.format(temp_wc)) + "C")
pressure_in = float(values['current_observation']['pressure_in'])
pressure_kp = float(values['current_observation']['pressure_mb']) / 10.0
print("The barometric pressure is", str('{:.2f}'.format(pressure_in)), "inches of mercury or", str('{:.1f}'.format(pressure_kp)), "kilopascals.")
wind_speed = float(values['current_observation']['wind_kph'])
wind_gust = float(values['current_observation']['wind_gust_kph'])
wind_dir = str(values['current_observation']['wind_dir'])
if wind_gust == 0:
print("The wind is", str('{:.2f}'.format(wind_speed)), "km/h from the", wind_dir)
else:
print("The wind is", str('{:.2f}'.format(wind_speed)), "km/h, gusting to", str('{:.2f}'.format(wind_gust)), "km/h from the", wind_dir)
#Forecast
print("Getting forecast...")
page = requests.get("http://api.wunderground.com/api/" + str(appid['key']) + "/forecast/q" + current_city['city'])
values = json.loads(page.text)
for x in [0, 1, 2, 3, 4, 5]:
print("Forecast for", values['forecast']['txt_forecast']['forecastday'][x]['title'], ":", values['forecast']['txt_forecast']['forecastday'][x]['fcttext_metric'])
waiting = 0 # loop until valid input
while waiting == 0:
exit = input("Press x to exit or c to check again...")
if exit == 'x' or 'X':
finished = 1
waiting = 1
elif exit == 'c' or 'C':
finished = 0
waiting = 1
else:
finished = 0
waiting = 0
if __name__ == "__main__":
getWeather()
答案 0 :(得分：1)
第110行（if elif内的while waiting阻止）中存在错误。正确的陈述是：
if exit == 'x' or exit == 'X'
你的陈述是if exit == 'x' or 'X'，这是不正确的。它将exit与x进行比较，但不与X进行比较。你要写的是如果exit等于x或者exit等于X 但是你已经为编码，则exit等于x或X为True 。现在＆＃39; X＆＃39;始终为true，它与输入无关（因为您没有将它与任何变量进行比较），因此无论输入如何，循环都会退出。 elif和else阻止了同样的错误。
这与C