如何读取CSV文件，格式化数据，统计生日出现的次数

如何读取CSV文件， 并对生日出现的次数

数据格式

读取文件代码

def read_csv(filename):
string_data = open(filename).read()
string_list = string_data.split("\n")[1:]
final_list = []

for row in string_list:
string_fields = row.split(",")
int_fields = []
for value in string_fields:
int_fields.append(int(value))
final_list.append(int_fields)
return final_list

cdc_list = read_csv("US_births_1994-2003_CDC_NCHS.csv")

统计生日出现的次数

def month_births(list_1):
births_per_month = {}
for item in list_1:
if item[1] in births_per_month:
births_per_month[item[1]] += item[-1]
else:
births_per_month[item[1]] = item[-1]
return births_per_month
cdc_month_births = month_births(cdc_list)

print(cdc_month_births)

result:
{1: 3232517, 2: 3018140, 3: 3322069, 4: 3185314, 5: 3350907, 6: 3296530, 7: 3498783, 8: 3525858, 9: 3439698, 10: 3378814, 11: 3171647, 12: 3301860}