Steam市场手续费计算相关代码

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因为自己的爬虫需要算社区手续费，所以简单看了一下Steam市场的js文件，关于手续费计算的主要函数为economy_common.js中209行GetItemPriceFromTotal函数。
计算方式有点复杂也不仔细看了，贴出来可用的python代码（请忽略命名规则等）

1. import math
   
2. 
   
3. g_rgWalletInfo = {
   
4.     "rwgrsn": -2,
   
5.     "success": True,
   
6.     "wallet_balance": "14669",
   
7.     "wallet_country": "CN",
   
8.     "wallet_currency": 23,
   
9.     "wallet_currency_increment": "1",
   
10.     "wallet_delayed_balance": "356",
    
11.     "wallet_fee": "1",
    
12.     "wallet_fee_base": "0",
    
13.     "wallet_fee_minimum": "7",
    
14.     "wallet_fee_percent": "0.05",
    
15.     "wallet_market_minimum": "7",
    
16.     "wallet_max_balance": "1400000",
    
17.     "wallet_publisher_fee_percent_default": "0.10",
    
18.     "wallet_state": "",
    
19.     "wallet_trade_max_balance": "1260000"
    
20. }
    
21. 
    
22. 
    
23. def CalculateFee(base_amt, pct, rgWallet):
    
24.     if pct > 0:
    
25.         return ToValidMarketPrice(math.floor(base_amt * pct), rgWallet)
    
26.     return 0
    
27. 
    
28. 
    
29. def GetTotalWithFees(base_amt, ppct, spct, rgWallet):
    
30.     nBase = ToValidMarketPrice(base_amt, rgWallet)
    
31.     nPubFee = CalculateFee(base_amt, ppct, rgWallet)
    
32.     nSteamFee = CalculateFee(base_amt, spct, rgWallet)
    
33.     return nBase + nPubFee + nSteamFee
    
34. 
    
35. 
    
36. def ToValidMarketPrice(nPrice, rgWallet):
    
37.     nFloor = int(rgWallet['wallet_market_minimum'])
    
38.     nIncrement = int(rgWallet['wallet_currency_increment'])
    
39.     if nPrice <= nFloor:
    
40.         return nFloor
    
41.     if nIncrement > 1:
    
42.         dAmount = nPrice / nIncrement
    
43.         dSign = -1 if dAmount < 0 else 1
    
44.         dAmount = (dSign * math.floor(abs(dAmount) + 0.5)) * nIncrement
    
45.         return dAmount
    
46.     return nPrice
    
47. 
    
48. 
    
49. def GetItemPriceFromTotal(nTotal, rgWallet):
    
50.     ppct = float(rgWallet['wallet_publisher_fee_percent_default'])
    
51.     spct = float(rgWallet['wallet_fee_percent'])
    
52.     nIncrement = int(rgWallet['wallet_currency_increment'])
    
53.     nFloor = int(rgWallet['wallet_market_minimum'])
    
54.     nInitialGuess = math.floor(nTotal / (1.0 + ppct + spct))
    
55.     nMaxBase = nTotal - (2 * nFloor)
    
56.     nBase = ToValidMarketPrice(min(nInitialGuess, nMaxBase), rgWallet)
    
57.     for i in range(3):
    
58.         nCalculated = GetTotalWithFees(nBase, ppct, spct, rgWallet)
    
59.         if nCalculated == nTotal:
    
60.             return nBase
    
61.         if nCalculated < nTotal:
    
62.             nBase += nIncrement
    
63.         else:
    
64.             nBase -= nIncrement
    
65.             break
    
66.     return max(nFloor, nBase)
    
67. 
    
68. 
    
69. if __name__ == '__main__':
    
70.     buyer = float(input("买家支付："))
    
71.     receive = GetItemPriceFromTotal(buyer * 100, g_rgWalletInfo) / 100
    
72.     print(f"您收款：{receive}")
    
73. 
    

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