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# coding: cp1251 | |
import pandas as pn | |
# block 1 | |
with open("titanic.csv") as f: # открываем данные титаника | |
data = f.read() | |
df = pn.read_csv("titanic.csv") # читаем данные | |
print("Количество выживших:", sum(df['Survived'])) | |
all_women_children = df[(df.Sex == "female") | (df.Age < 18)] | |
survived_women_children = df[((df.Sex == "female") | (df.Age < 18)) & (df.Survived == 1)] | |
print("Доля выживших женщин и детей: {0:.0%}".format(len(survived_women_children) / len(all_women_children))) | |
all_men = df[(df.Sex == "male")] | |
survived_men = df[(df.Sex == "male") & (df.Survived == 1)] | |
print("Доля выживших мужчин: {0:.0%}".format(len(survived_men) / len(all_men))) | |
first_class = df[(df.Pclass == 1)] # Не знаю правильно ли я понял, что первый класс это Pclass=1 | |
print("Доля пассажиров первого класса: {0:.0%}".format(len(first_class) / len(df))) | |
children = df[(df.Age < 18)] | |
print("Доля детей: {0:.0%}".format(len(children) / len(df))) | |
# block 2 | |
# 1 | |
def y(x): | |
if x < 1: | |
y = (x**2-1)**2 | |
elif x > 1: | |
y = 1 / (1+x)**2 | |
elif x == 1: | |
y = 0 | |
return y | |
a = float(input("Введите a: ")) | |
b = float(input("Введите b: ")) | |
h = float(input("Введите h: ")) | |
df = pn.DataFrame(columns=["x", "y(x)"]) # задаём датафрейм | |
df.index.name = "Id" | |
i = 0 | |
while a <= b: | |
x = a | |
df.loc[i] = [x, round(y(x), 5)] # записываем очередную строку результата | |
a += h | |
i += 1 | |
# 2 | |
print(df) | |
# 3 | |
df.loc[len(df)] = [b+1, y(b+1)] # добавляем новую строку | |
print(df) | |
# 4 | |
df = df.drop(0) # удаляем первую строку | |
print(df) | |
# 5 | |
df = df[df.x >= b // 2] # удаляем строки, где x < b // 2 | |
print(df) | |
# 6 | |
df.to_csv("dataframe.csv", sep=",") # записываем всю хурму в файл |
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