Airplane info

import urllib.request

def getDimensions(url, data):
    req = urllib.request.Request(url)
    page = urllib.request.urlopen(req)
    pstr = page.read()
    psplit = str(pstr).split("Dimensions")
    info = ""
    for char in psplit[1]:
        info = info + char
        try:
            end = info[-3:]
            if end == "<b>":
                info = info[:-3]
                break
        except: pass
    
    info = info.lower()
    parts = info.split("\\n")
    
    infopart = ""
    for i in parts:
        if "wing span" in i:
            infopart = i.strip("<p>")
            
    infodic = {}
    for i in data:
        index = infopart.find(i)
        result = ""
        if not index == -1:
            index = index + len(i)
            while True:
                char = infopart[index]
                if not char == "(":
                    result = result + char
                else:
                    infodic[i] = result.lstrip().rstrip()
                    break
                index +=1
    return infodic

    
ratiolist = []

for i in range(1, 409):
    print("Airplane " + str(i) + " of 408:")
    try:
        dim = getDimensions("http://www.airliners.net/aircraft-data/stats.main?id=" + str(i), ["wing span", "length"])
        wspan = float(dim["wing span"].strip("m"))
        length = float(dim["length"].strip("m"))
        ratio = wspan / length
        print("Wingspan: ", wspan)
        print("Length: ", length)
        print("Ratio: ", ratio)
        ratiolist.append(ratio)
    except:
        print("Could not get data. Moving on...")
    print()

print("Average: ",  (sum(ratiolist) / len(ratiolist)))