Base Line/python 기초 코드
pandas - 1
ylab
2022. 7. 1. 22:04
from pandas import Series, DataFrame
import pandas as pd
list_data = [1,2,3,4,5]
example_obj = Series(data = list_data)
example_obj
list_data = [1,2,3,4,5]
list_name = ["a","b","c","d","e"]
example_obj = Series(data = list_data, index = list_name)
example_obj
import numpy as np
dict_data = {"a":1,"b":2,"c":3,"d":4,"e":5}
example_obj = Series(dict_data,dtype=np.float32,name="example_data")
example_obj
example_obj["a"]
example_obj["a"] = 3.2
example_obj
example_obj.values
example_obj.index
example_obj.name = "number"
example_obj.index.name = "alphabet"
example_obj
dict_data_1 = {"a":1,"b":2,"c":3,"d":4,"e":5}
indexes = ["a","b","c","d","e","f","g","h"]
series_obj_1 = Series(dict_data_1,index = indexes)
series_obj_1
# dataframe : Series를 모아서 만든 Data Table = 기본 2차원
from pandas import Series, DataFrame
import pandas as pd
import numpy as np
from pandas import Series, DataFrame
import pandas as pd
import numpy as np
raw_data = {'first_name' : ['Jason','Molly','Tina','Jake','Any'],
'last_name':['Miler','Jacobson','Ali','Milner','Cooze'],
'age':[42,52,36,24,73],
'city':['San Francisco','Baltimore','Miami','Douglas','Boston']}
df = pd.DataFrame(raw_data,columns = ['first_name','last_name','age','city'])
df
df = DataFrame(raw_data,columns=["first_name","last_name","age","city","debt"])
df.first_name
df["first_name"]
df
#index location
df.loc[1]
#index position
df["age"].iloc[1:]
s= pd.Series(np.nan,index = [49,48,47,46,45,1,2,3,4,5])
s.loc[:3]
s.iloc[:3]
df.debt = df.age>40
df
df.T
df.values
df.to_csv()
del df["debt"]
df
df[:3]
df
import pandas as pd
import numpy as np
url = 'exceltasks/excel-comp-data.xlsx'
df = pd.read_excel(url)
df.head()df["account"][:3]
account_series = df["account"]
account_series[:3]
account_series[[0,1,2]]
account_series[account_series<250000]
df.index = df["account"]
del df["account"]
df.head()
df[["name","street"]][:2]
df.iloc[:,:2]
df.loc[[211829,320563],["name","street"]]
df.index = list(range(0,15))
df.head()
df.drop(1)
df.drop([0,1,2,3])
df.drop("city",axis=1) #df.drop(["city","state"],axis=1)
from pandas import Series
s1 = Series(range(1,6),index = list("abcde"))
s1
s2 = Series(range(5,11),index = list("bcedef"))
s2
s1.add(s2)
s1+s2
from pandas import DataFrame
df1 = DataFrame(np.arange(9).reshape(3,3),columns = list("abc"))
df1
df2 = DataFrame(np.arange(16).reshape(4,4),columns = list("abcd"))
df2
df1+df2
df1.add(df2,fill_value=0)
df = DataFrame(np.arange(16).reshape(4,4),columns = list("abcd"))
df
s2 = Series(np.arange(10,14))
s2
df+s2
df.add(s2,axis=0)
s1 = Series(np.arange(10))
s1.head(5)
s1.map(lambda x :x**2).head(5)z={1:'A',2:'B',3:'C'}
s1.map(z).head(5)
s2 = Series(np.arange(10,20))
s1.map(s2).head(5)
df = pd.read_csv("wages.csv")
df.head()
df.sex.unique()
df["sex_code"] = df.sex.map({"male":0,"female":1}).head()
df.sex.replace(["male","female"],[0,1],inplace = True)
df.head(5)
df_info = df[["earn","height","age"]]
df_info.head()
f = lambda x : x.max() - x.min()
df_info.apply(f)
df_info.sum()
df_info.apply(sum)
f = lambda x : -x
df_info.applymap(f).head(5)
f = lambda x : -x
df_info["earn"].apply(f).head(5)
df = pd.read_csv("wages.csv")
df.head()
df.describe()
df.race.unique()
np.array(dict(enumerate(df["race"].unique())))
value = list(map(int,np.array(list(enumerate(df["race"].unique())))[:,0].tolist()))
key = np.array(list(enumerate(df["race"].unique())),dtype=str)[:,1].tolist()
value,key
df["race"].replace(to_replace=key,value = value,inplace = True)
df.head(5)
#column
df.sum(axis = 0)
#row
df.sum(axis = 1)
df.isnull()
df.isnull().sum()
df.sort_values(["age","earn"],ascending=True).head(10)
df.age.corr(df.earn)
df.age.cov(df.earn)
df.corrwith(df.earn)
df.corr()# data
import pandas as pd
ipl_data = {'Team': ['Riders', 'Riders', 'Devils', 'Devils', 'Kings',
'kings', 'Kings', 'Kings', 'Riders', 'Royals', 'Royals', 'Riders'],
'Rank': [1, 2, 2, 3, 3,4 ,1 ,1,2 , 4,1,2],
'Year': [2014,2015,2014,2015,2014,2015,2016,2017,2016,2014,2015,2017],
'Points':[876,789,863,673,741,812,756,788,694,701,804,690]}
df = pd.DataFrame(ipl_data)
df
df.groupby("Team")["Points"].sum()
df.groupby(["Team","Year"])["Points"].sum()
df
h_index = df.groupby(["Team","Year"])["Points"].sum()
h_index
h_index.index
h_index["Devils":"Kings"]
h_index.unstack()
h_index.swaplevel()
h_index.swaplevel().sort_index(level=0)
h_index.sum(level=0)
h_index.sum(level=1)
grouped = df.groupby("Team")
for name, group in grouped:
print(name)
print(group)
grouped.get_group("Devils")
grouped.agg(sum)
import numpy as np
grouped.agg(np.mean)
grouped['Points'].agg([np.sum, np.mean,np.std])
df
score = lambda x:(x)
grouped.transform(score)
df
score = lambda x : (x.max())
grouped.transform(score)
df
score = lambda x : (x - x.mean())/x.std()
grouped.transform(score)
df.groupby('Team').filter(lambda x: len(x) >=3)
import dateutil
import pandas as pd
df_phone = pd.read_csv("phone_data.csv")
df_phone['date'] = df_phone['date']
df_phone.groupby('month')['duration'].sum()
df_phone[df_phone['item']=='call'].groupby('network')['duration'].sum()
df_phone.groupby(['month','item'])['date'].count()
df_phone.groupby(['month','item'])['date'].count().unstack()
df_phone.groupby('month',as_index=False).agg({"duration":"sum"})
df_phone.groupby(['month','item']).agg({'duration':sum,
'network_type':"count",
'date':'first'})
df_phone.groupby(['month','item']).agg({'duration':[min,max,sum],
'network_type':"count",
'date':[min,'first','nunique']})
import numpy as np
grouped = df_phone.groupby('month').agg({"duration":[min,max,np.mean]})
grouped.columns = grouped.columns.droplevel(level=0)
grouped.rename(columns={"min":"min_duration","max":"max_duration","mean":"mean_duration"})
df_phone.pivot_table(["duration"],
index = [df_phone.month,df_phone.item],
columns = df_phone.network, aggfunc="sum",fill_value=0)
df_movie = pd.read_csv("movie_rating.csv")
df_movie.head()
pd.crosstab(index=df_movie.critic,columns=df_movie.title,values = df_movie.rating,aggfunc="first").fillna(0)
df_movie.pivot_table(["rating"],index = df_movie.critic,columns = df_movie.title, aggfunc="sum",fill_value=0)
pd.merge(df_a,df_b,left_on = 'subject_id',right_on='subject_id')
pd.merge(df_a,df_b,on='subject_id',how = 'left')
pd.merge(df_a,df_b,on = 'subject_id',how = 'right')
pd.merge(df_a,df_b,on'subject_id',how = 'outer')
pd.merge(df_a,df_b,on = 'subject_id',how = 'inner')
pd.merge(df_a,df_b,right_index=True,left_index=True)
df_new = pd.concat([df_a,df_b])
df_new.reset_index()
df_a.append(df_b)
df_new = pd.concat([df_a,df_b],axis=1)
df_new.reset_index()
import sqlite3
conn = sqlite3.connext("./data/flights.db")
cur = conn.cursor()
cur.execute("select*from airlines limit 5;")
results = cur.fetchall()
results
df_airplines = pd.read_sql_query("select*from airlines;",conn)
df_airports = pd.read_sql_query("select*from airports;",conn)
df_routes = pd.read_sql_query("select * from routes;",conn)
df_routes.to_pickle("./data/df_routes.pickle")
df_routes_pickle = pd.read_pickle("./data/df_routes.pickle")
df_routes_pickle.head()
writer = pd.ExcelWriter('./data/df_routes.xlsx',engine = 'xlsxwriter')
df_routes.to_excel(writer,sheet_name = 'Sheet1')reference : https://github.com/TeamLab/introduction_to_python_TEAMLAB_MOOC