For循环不会遍历字典

如何解决For循环不会遍历字典

所以我的代码在下面

import requests
import json

with open("forex_rates.json","r") as file:
    rate = json.load(file)
    nrate = rate

Base = input("enter your base currency: ")
if Base not in rate["rates"]:
    print("That's not a valid currency...")
    Base = input("enter your base currency: ")

with open("forex_rates.json","r") as file:
    nrate["base"] = Base
    for i in rate["rates"]:
        nrate["rates"][i] = rate["rates"].get(i) / rate["rates"].get(Base)
        
print(nrate["rates"])

我正在尝试制作一个可以转换不同货币的程序，例如： 1欧元-> 1.18美元 为了做到这一点，我必须根据基准值每次编辑外汇汇率 当我完成代码后，我运行了它，一切正常，它转换了所有值，直到在外汇价值文件中达到相同的值 就像如果我从USD转换，它将根据USD更改所有货币值，但是当文件中的USD达到USD时，循环中断 我尝试了很长时间，直到尝试将USD移到文件的最底部为止，因为它没有损坏的余地。确实有效，但这仅适用于美元。 当我在程序中更改基本值时，它将再次中断

对于那些说代码甚至还没有完成的人，我会说我几乎将程序的这一部分完成了转换部分，我认为最困难的部分，剩下的任何其他代码只是GUI和一些乘法运算>

，我将在下面列出外汇数据 ＃对不起，如果太大的话

{
  "success":true,"timestamp":1597402446,"base":"EUR","date":"2020-08-14","rates":{
    "AED":4.335266,"AFN":91.176403,"ALL":123.979569,"AMD":572.651268,"ANG":2.125143,"AOA":695.22591,"ARS":86.213707,"AUD":1.651881,"AWG":2.124558,"AZN":2.001576,"BAM":1.954795,"BBD":2.390258,"BDT":100.546318,"BGN":1.956895,"BHD":0.444938,"BIF":2283.56194,"BMD":1.18031,"BND":1.622912,"BOB":8.173103,"BRL":6.336422,"BSD":1.183874,"BTC":0.0001,"BTN":88.576746,"BWP":13.863097,"BYN":2.914727,"BYR":23134.077322,"BZD":2.38624,"CAD":1.562064,"CDF":2302.785095,"CHF":1.074967,"CLF":0.033942,"CLP":936.574514,"CNY":8.203627,"COP":4452.129574,"CRC":704.672423,"CUC":1.18031,"CUP":31.278217,"CVE":110.201987,"CZK":26.106129,"DJF":210.746982,"DKK":7.446693,"DOP":69.149105,"DZD":151.514114,"EGP":18.805169,"ERN":17.704664,"ETB":42.448715,"EUR":1,"FJD":2.523208,"FKP":0.90119,"GBP":0.900976,"GEL":3.647475,"GGP":0.90119,"GHS":6.811663,"GIP":0.90119,"GMD":61.163652,"GNF":11418.288925,"GTQ":9.116687,"GYD":247.470583,"HKD":9.14817,"HNL":29.203723,"HRK":7.531326,"HTG":132.978265,"HUF":346.161502,"IDR":17595.177253,"ILS":4.019203,"IMP":0.90119,"INR":88.434024,"IQD":1413.229387,"IRR":49696.95603,"ISK":161.076893,"JEP":0.90119,"JMD":176.632894,"JOD":0.836814,"JPY":125.951475,"KES":127.822789,"KGS":92.238283,"KHR":4859.521032,"KMF":491.421896,"KPW":1062.314938,"KRW":1401.210938,"KWD":0.360975,"KYD":0.986486,"KZT":496.331879,"LAK":10752.381531,"LBP":1789.879783,"LKR":216.488093,"LRD":235.294815,"LSL":20.549263,"LTL":3.485149,"LVL":0.713958,"LYD":1.626859,"MAD":10.913322,"MDL":19.82872,"MGA":4566.909302,"MKD":61.58448,"MMK":1610.391686,"MNT":3362.205621,"MOP":9.449856,"MRO":421.37087,"MUR":46.799002,"MVR":18.243058,"MWK":879.737053,"MXN":26.199071,"MYR":4.949633,"MZN":83.979304,"NAD":20.548996,"NGN":449.107914,"NIO":41.242296,"NOK":10.544902,"NPR":141.752962,"NZD":1.80663,"OMR":0.454403,"PAB":1.183663,"PEN":4.2222,"PGK":4.165565,"PHP":57.516411,"PKR":199.282277,"PLN":4.396536,"PYG":8227.988848,"QAR":4.297547,"RON":4.835722,"RSD":117.576625,"RUB":86.625365,"RWF":1142.595148,"SAR":4.426709,"SBD":9.756128,"SCR":21.044237,"SDG":65.300702,"SEK":10.291595,"SGD":1.620105,"SHP":0.90119,"SLL":11537.53114,"SOS":689.301231,"SRD":8.802808,"STD":25132.067341,"SVC":10.358743,"SYP":603.981109,"SZL":20.627972,"THB":36.753085,"TJS":12.208818,"TMT":4.131085,"TND":3.240537,"TOP":2.698542,"TRY":8.706498,"TTD":8.006077,"TWD":34.707966,"TZS":2744.220413,"UAH":32.433598,"UGX":4343.852885,"USD":1.18031,"UYU":50.261259,"UZS":12111.300903,"VEF":11.788346,"VND":27353.095658,"VUV":134.283098,"WST":3.09309,"XAF":655.754247,"XAG":0.044343,"XAU":0.000606,"XCD":3.189847,"XDR":0.840933,"XOF":655.720927,"XPF":119.624668,"YER":295.426891,"ZAR":20.617975,"ZMK":10624.212769,"ZMW":21.85909,"ZWL":380.05997
  }
}