Return Letter Combinations
0 likes • Nov 18, 2022
Python
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def sum_of_powers(end, power = 2, start = 1):return sum([(i) ** power for i in range(start, end + 1)])sum_of_powers(10) # 385sum_of_powers(10, 3) # 3025sum_of_powers(10, 3, 5) # 2925
filename = "data.txt"data = "Hello, World!"with open(filename, "a") as file:file.write(data)
""" Currency Converter----------------------------------------"""import urllib.requestimport jsondef currency_converter(currency_from, currency_to, currency_input):yql_base_url = "https://query.yahooapis.com/v1/public/yql"yql_query = 'select%20*%20from%20yahoo.finance.xchange%20where%20pair' \'%20in%20("'+currency_from+currency_to+'")'yql_query_url = yql_base_url + "?q=" + yql_query + "&format=json&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys"try:yql_response = urllib.request.urlopen(yql_query_url)try:json_string = str(yql_response.read())json_string = json_string[2:json_string = json_string[:-1]print(json_string)yql_json = json.loads(json_string)last_rate = yql_json['query']['results']['rate']['Rate']currency_output = currency_input * float(last_rate)return currency_outputexcept (ValueError, KeyError, TypeError):print(yql_query_url)return "JSON format error"except IOError as e:print(str(e))currency_input = 1#currency codes : http://en.wikipedia.org/wiki/ISO_4217currency_from = "USD"currency_to = "TRY"rate = currency_converter(currency_from, currency_to, currency_input)print(rate)
# Listlst = [1, 2, 3, 'Alice', 'Alice']# One-Linerindices = [i for i in range(len(lst)) if lst[i]=='Alice']# Resultprint(indices)# [3, 4]
from collections import defaultdictdef combine_values(*dicts):res = defaultdict(list)for d in dicts:for key in d:res[key].append(d[key])return dict(res)d1 = {'a': 1, 'b': 'foo', 'c': 400}d2 = {'a': 3, 'b': 200, 'd': 400}combine_values(d1, d2) # {'a': [1, 3], 'b': ['foo', 200], 'c': [400], 'd': [400]}
def print_x_pattern(size):i,j = 0,size - 1while j >= 0 and i < size:initial_spaces = ' '*min(i,j)middle_spaces = ' '*(abs(i - j) - 1)final_spaces = ' '*(size - 1 - max(i,j))if j == i:print(initial_spaces + '*' + final_spaces)else:print(initial_spaces + '*' + middle_spaces + '*' + final_spaces)i += 1j -= 1print_x_pattern(7)