I indexed the available currencies steam uses for argument
¤cy=3
as:
1 : $63.83
2 : £46.85
3 : 52,--€
4 : CHF 56.41
5 : 4721,76 pуб.
6 : 235,09zł
7 : R$ 340,80
8 : ¥ 6,627.08
9 : 534,70 kr
10 : Rp 898 383.24
11 : RM257.74
12 : P3,072.66
13 : S$84.47
14 : ฿1,921.93
15 : 1.474.136,93₫
16 : ₩ 69,717.79
17 : 468,47 TL
18 : 2 214,94₴
19 : Mex$ 1,557.75
20 : CDN$ 99.09
21 : A$ 100.40
22 : NZ$ 107.55
23 : ¥ 505.96
24 : ₹ 5,733.04
25 : CLP$ 55.695,47
26 : S/.283.03
27 : COL$ 271.637,06
28 : R 1 193.49
29 : HK$ 606.83
30 : NT$ 2,189.42
31 : 293.64 SR
32 : 287.51 AED
Python dictionary with currency abbreviations and their codes:
currencies = {
    "USD": 1,  # United States dollar
    "GBP": 2,  # British pound sterling
    "EUR": 3,  # The euro
    "CHF": 4,  # Swiss franc
    "RUB": 5,  # Russian ruble
    "PLN": 6,  # Polish złoty
    "BRL": 7,  # Brazilian real
    "JPY": 8,  # Japanese yen
    "SEK": 9,  # Swedish krona
    "IDR": 10,  # Indonesian rupiah
    "MYR": 11,  # Malaysian ringgit
    "BWP": 12,  # Botswana pula
    "SGD": 13,  # Singapore dollar
    "THB": 14,  # Thai baht
    "VND": 15,  # Vietnamese dong
    "KRW": 16,  # South Korean won
    "TRY": 17,  # Turkish lira
    "UAH": 18,  # Ukrainian hryvnia
    "MXN": 19,  # Mexican Peso
    "CAD": 20,  # Canadian dollar
    "AUD": 21,  # Australian dollar
    "NZD": 22,  # New Zealand dollar
    "CNY": 23,  # Chinese yuan
    "INR": 24,  # Indian rupee
    "CLP": 25,  # Chilean peso
    "PEN": 26,  # Peruvian sol
    "COP": 27,  # Colombian peso
    "ZAR": 28,  # South African rand
    "HKD": 29,  # Hong Kong dollar
    "TWD": 30,  # New Taiwan dollar
    "SAR": 31,  # Saudi riyal
    "AED": 32  # United Arab Emirates dirham
}