uso de funções csv.DictReader() e csv.DictWriter() para ler e escrever ficheiros csv

README.md

@@ -48,6 +48,3 @@ https://api.coingecko.com/api/v3/coins/bitcoin/market_chart?vs_currency=eur&days
 
 https://api.coingecko.com/api/v3/coins/bitcoin/ohlc?vs_currency=eur&days=365&precision=3
 
-
-
-

crypto_portfolio.py

@@ -1,14 +1,33 @@
 import requests
 import time
-# import datetime
 
-baseURL = 'https://api.coingecko.com/api/v3/'
+base_url = 'https://api.coingecko.com/api/v3/'
 coin = 'bitcoin'
 vs_currency = 'eur'
-days = '30'
+days = '365'
 precision = '3'
+intervalo = 'daily'
 
-ohlc_endpoint = baseURL + 'coins/' + coin + '/ohlc?vs_currency=' + vs_currency + '&days=' + days + '&precision=' + precision
+historico_precos_header = [ 
+    "data",
+    "moeda",
+    "preco_abertura",
+    "preco_maximo",
+    "preco_minimo",
+    "preco_fecho"
+]
+
+portfolio_headers = [
+    "data",
+    "moeda",
+    "quantidade",
+    "movimento"
+]
+
+# https://api.coingecko.com/api/v3/coins/bitcoin/market_chart?vs_currency=eur&days=365&interval=daily
+url_historico_preco = base_url + 'coins/' + coin + '/market_chart?vs_currency=' + vs_currency + '&days=' + days + '&interval=' + intervalo + '&precision=' + precision
+# https://api.coingecko.com/api/v3/coins/bitcoin/ohlc?vs_currency=eur&days=30&precision=3
+url_preco_ohlc = base_url + 'coins/' + coin + '/ohlc?vs_currency=' + vs_currency + '&days=' + days + '&precision=' + precision
 
 APY_KEY = "CG-K5RS5VXsdFDip2UvY3z8VjQP"
 
@@ -17,17 +36,25 @@ headers = {
     'x-cg-demo-api-key': APY_KEY
 }
 
-#print(ohlc_endpoint)
+# tipo de pesquisa
+url_consulta = url_historico_preco
 
-response = requests.get(ohlc_endpoint, headers= headers)
+response = requests.get(url_consulta, headers= headers)
 
 if response.status_code == 200:
     data = response.json()
-    print(len(data))
-    date = time.ctime(data[0][0]/1000)
-    date_as_string = time.strftime("%d/%m/%Y", time.gmtime(data[0][0]/1000))
-    ohlc = [ data[0][1], data[0][2], data[0][3], data[0][4] ]
+    print(len(data['prices']))
+    #print(data)
+
+    for index in range(0, len(data['prices'])):
+        #date = time.ctime(data['prices'][index][0]/1000)
+        date_as_string = time.strftime("%d/%m/%Y", time.gmtime(data['prices'][index][0]/1000))
+        price = data['prices'][index][1]
+        print(f'{date_as_string} -> {price}')
+    
+    # ohlc = [ data[0][1], data[0][2], data[0][3], data[0][4] ]
+
+    # print(f'price of bitcoin in {date_as_string}:\nopen: {ohlc[0]}\nhigh: {ohlc[1]}\nlow: {ohlc[2]}\nclose: {ohlc[3]}')
 
-    print(f'price of bitcoin in {date_as_string}:\nopen: {ohlc[0]}\nhigh: {ohlc[1]}\nlow: {ohlc[2]}\nclose: {ohlc[3]}')
 else:
     print('failed to retrive data')

historico_preco.csv

@@ -1 +0,0 @@
-data,moeda,preco_abertura,preco_maximo,preco_minimo,preco_fecho

historico_precos.csv

@@ -0,0 +1,181 @@
+data_unix,criptomoeda,vs_currency,preco_abertura,preco_maximo,preco_minimo,preco_fecho
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portfolio.py

@@ -0,0 +1,61 @@
+# script para criar um historico de preços de criptomoedas, guardado em ficheiro CSV, com intuito de utilizar este historico de precos para acompanhar evolução de portfolio de criptomoedas
+
+# aceder ao historico de preços OHLC de CoinGecko através da API
+#   máximo de requests mensal: 10000 (320/dia; 13/hora)
+#   . referenciar o uso da CoinGecko através de branding oficial e link para site (https://www.coingecko.com/en/branding)
+#   . documentação API: https://docs.coingecko.com/v3.0.1/reference/introduction
+#   . obter OHLC: https://docs.coingecko.com/v3.0.1/reference/coins-id-ohlc
+import requests
+
+url_raiz_API = 'https://api.coingecko.com/api/v3/'
+
+criptomoeda = 'bitcoin'
+vs_currency = 'eur'
+dias = '30'
+precisao = '3'
+url_consulta_ohlc = 'coins/' + criptomoeda + '/ohlc?vs_currency=' + vs_currency + '&days=' + dias + '&precision=' + precisao
+
+url = url_raiz_API + url_consulta_ohlc
+
+CHAVE_API = 'CG-K5RS5VXsdFDip2UvY3z8VjQP'
+headers = {
+    'accept': 'application/json',
+    'x-cg-demo-api-key': CHAVE_API
+}
+
+resposta = requests.get(url, headers= headers)
+# carregar dados já existentes em ficheiro CSV (criar ficheiro se não existir)
+import csv
+import os
+cabecalho: list = [ 'data_unix', 'criptomoeda', 'vs_currency', 'preco_abertura', 'preco_maximo', 'preco_minimo', 'preco_fecho' ]
+caminho_ficheiro_csv_historico_bitcoin = './historico_precos.csv'
+if (os.path.exists(caminho_ficheiro_csv_historico_bitcoin) == False):
+    ficheiro = open(caminho_ficheiro_csv_historico_bitcoin, 'w+', newline='')
+    ficheiroCSV = csv.DictWriter(ficheiro, fieldnames=cabecalho)
+    ficheiroCSV.writeheader()
+    ficheiro.close()
+with open(caminho_ficheiro_csv_historico_bitcoin, 'r', newline='') as ficheiro_csv_historico_precos:
+    ficheiroCSV = csv.DictReader(ficheiro_csv_historico_precos)
+    entradas: list = []
+    for linha in ficheiroCSV:
+        entradas.append(linha)
+
+# converter dados de coingecko para o formato usado no ficheiro CSV
+novas_linhas: list = []
+for linha_resposta in resposta.json():
+    nova_entrada: dict = {}
+    nova_entrada[cabecalho[0]] = linha_resposta[0]
+    nova_entrada[cabecalho[1]] = criptomoeda
+    nova_entrada[cabecalho[2]] = vs_currency
+    nova_entrada[cabecalho[3]] = linha_resposta[1]
+    nova_entrada[cabecalho[4]] = linha_resposta[2]
+    nova_entrada[cabecalho[5]] = linha_resposta[3]
+    nova_entrada[cabecalho[6]] = linha_resposta[4]
+    novas_linhas.append(nova_entrada)
+# eliminar registos que não sejam novos
+
+# gravar dados importados
+with open(caminho_ficheiro_csv_historico_bitcoin, 'w+', newline='') as ficheiro_csv_historico_precos:
+    ficheiroCSV = csv.DictWriter(ficheiro_csv_historico_precos, fieldnames=cabecalho)
+    ficheiroCSV.writeheader()
+    ficheiroCSV.writerows(entradas)