ÆÇ´Ù½º Series¿Í DataFrame¿¡ ´ëÇؼ °£´ÜÇÏ°Ô ¾Ë¾Æ º»´Ù. Series´Â 1Â÷¿ø ¹è¿ÀÌ°í DataFrameÀº 2Â÷¿ø ¹è¿ÀÌ´Ù. Series ±âº»ditionary, list, tuple·Î ÆÇ´Ù½º ½Ã¸®Áî·Î º¯È¯ÇÏ°í ÀÖ´Ù.import pandas as pd
#dictionary data1 = { 'a': 1, 'b': 2, 'c': 3} #sr = pd.Series(data1) #list data2 = [1, 2, 3] #tuple #data2 = (1, 2, 3) #available #sr = pd.Series(data2) sr = pd.Series(data2, index=['a', 'b', 'c']) #print(type(sr)) print("\n") print(sr['a']) #print(sr[0]) print(sr) #print(sr[[0, 1, 2]]) °á°ú) 1 a 1 b 2 c 3 dtype: int64 DataFrame ±âº»dictionary·Î »ý¼ºimport pandas as pd
data1 = { 'a': [10, 20, 30], 'b': [11, 21, 31], 'c': [12, 22, 32]} df = pd.DataFrame(data1) print(type(df)) print(df) DataFrameÀº Çà(row)°ú ¿(Column)·Î ±¸¼ºµÈ 2Â÷¿ø ¹è¿ÀÌ´Ù. ditionary´Â ¿ ´ÜÀ§·Î ä¿öÁø´Ù. °á°ú) <class 'pandas.core.frame.DataFrame'> a b c 0 10 11 12 1 20 21 22 2 30 31 32 list·Î »ý¼ºimport pandas as pd
data1 = [10, 20, 12] df = pd.DataFrame(data1, index=['Á¦·Î', 'Çϳª', 'µÑ'], columns=['a']) print(type(df)) print(df) °á°ú) <class 'pandas.core.frame.DataFrame'> a Á¦·Î 10 Çϳª 20 µÑ 12 import pandas as pd
data1 = [[10, 20, 30], [11, 21, 31], [12, 22, 32]] df = pd.DataFrame(data1, index=['Á¦·Î', 'Çϳª', 'µÑ'], columns=['a', 'b', 'c']) print(type(df)) print(df) dictionary¿Í list°¡ ºñ½ÁÇÏÁö¸¸ 2Â÷¿ø ¸®½ºÆ®À϶§´Â dictionary´Â Çà¿ì¼±, list´Â ¿¿ì¼±ÀÌ´Ù. °á°ú) <class 'pandas.core.frame.DataFrame'> a b c Á¦·Î 10 20 30 Çϳª 11 21 31 µÑ 12 22 32 Çà À妽º, ¿ À̸§ ¼³Á¤import pandas as pd
data1 = [[10, 20, 30], [11, 21, 31], [12, 22, 32]] df = pd.DataFrame(data1, index=['Á¦·Î', 'Çϳª', 'µÑ'], columns=['a', 'b', 'c']) print(type(df)) print(df) °á°ú) <class 'pandas.core.frame.DataFrame'> a b c Á¦·Î 10 20 30 Çϳª 11 21 31 µÑ 12 22 32 À妽º À̸§À¸·Î Çà ¼±Åà locimport pandas as pd
data1 = [[10, 20, 30], [11, 21, 31], [12, 22, 32]] df = pd.DataFrame(data1, index=['Á¦·Î', 'Çϳª', 'µÑ'], columns=['a', 'b', 'c']) df0 = df.loc['Á¦·Î'] df1 = df.loc[['Á¦·Î', 'µÑ']] df2 = df.loc['Á¦·Î' : 'µÑ'] print(type(df0)) print(df0) print(type(df1)) print(df1) print(type(df2)) print(df2) loc : - À妽º À̸§ ÁöÁ¤ ex) df.loc['Á¦·Î'] df.loc[['Á¦·Î', 'µÑ']] - À妽º À̸§À¸·Î ¹üÀ§ ÁöÁ¤ df.loc['Á¦·Î' : 'µÑ'] °á°ú) <class 'pandas.core.series.Series'> a 10 b 20 c 30 Name: Á¦·Î, dtype: int64 <class 'pandas.core.frame.DataFrame'> a b c Á¦·Î 10 20 30 µÑ 12 22 32 <class 'pandas.core.frame.DataFrame'> a b c Á¦·Î 10 20 30 Çϳª 11 21 31 µÑ 12 22 32 À妽º·Î Ç༱Åà ilocimport pandas as pd
data1 = [[10, 20, 30], [11, 21, 31], [12, 22, 32]] df = pd.DataFrame(data1, index=['Á¦·Î', 'Çϳª', 'µÑ'], columns=['a', 'b', 'c']) df0 = df.iloc[0] df1 = df.iloc[[0, 2]] df2 = df.iloc[0 : 2] print(type(df0)) print(df0) print(type(df1)) print(df1) print(type(df2)) print(df2) À妽º À̸§°ú À妽º·Î ÇÒ¶§ ½½¶óÀ̽̿¡¼ Â÷ÀÌÁ¡ÀÌ ÀÖ´Ù. À妽º À̸§ ½½¶óÀ̽Ì: ³¡ À̸§±îÁö Æ÷ÇÔÀÌ´Ù. À妽º ½½¶óÀ̽Ì: ³¡ À妽º´Â Æ÷ÇÔÇÏÁö ¾Ê´Â´Ù. °á°ú) <class 'pandas.core.series.Series'> a 10 b 20 c 30 Name: Á¦·Î, dtype: int64 <class 'pandas.core.frame.DataFrame'> a b c Á¦·Î 10 20 30 µÑ 12 22 32 <class 'pandas.core.frame.DataFrame'> a b c Á¦·Î 10 20 30 Çϳª 11 21 31 ¿¼±ÅÃimport pandas as pd
data1 = [[10, 20, 30], [11, 21, 31], [12, 22, 32]] df = pd.DataFrame(data1, index=['Á¦·Î', 'Çϳª', 'µÑ'], columns=['a', 'b', 'c']) df0 = df['a'] df1 = df.a dcol = df.columns df2 = df[dcol[0]] df3 = df[['a', 'c']] df4 = df[df.columns[:3]] print(type(df0)) print(df0) print(type(df1)) print(df1) print(type(df2)) print(df2) print(type(df3)) print(df3) print(type(df4)) print(df4) ¿¼±ÅÃÀº DataFrame °´Ã¼[¿À̸§]ÀÌ´Ù. ex) df0 = df['a'] ¿À妽º·Î ¼±ÅÃÇÒ·Á¸é ´ÙÀ½°ú °°ÀÌ ÇÑ´Ù. dcol = df.columns df2 = df[dcol[0]] À妽º¸¦ Á÷Á¢ ³ÖÀ¸¸é ¿¡·¯°¡ ¹ß»ýÇÑ´Ù. ¿©·¯°³ÀÇ ¿ ¼±Åà ex) df3 = df[['a', 'c']] ¿ ½½¶óÀ̵̽µ columns¸¦ ÀÌ¿ëÇÑ´Ù. df4 = df[df.columns[:3]] °á°ú) <class 'pandas.core.series.Series'> Á¦·Î 10 Çϳª 11 µÑ 12 Name: a, dtype: int64 <class 'pandas.core.series.Series'> Á¦·Î 10 Çϳª 11 µÑ 12 Name: a, dtype: int64 <class 'pandas.core.series.Series'> Á¦·Î 10 Çϳª 11 µÑ 12 Name: a, dtype: int64 <class 'pandas.core.frame.DataFrame'> a c Á¦·Î 10 30 Çϳª 11 31 µÑ 12 32 <class 'pandas.core.frame.DataFrame'> a b c Á¦·Î 10 20 30 Çϳª 11 21 31 µÑ 12 22 32 ¿ø¼Ò ¼±ÅÃimport pandas as pd
data1 = [[10, 20, 30], [11, 21, 31], [12, 22, 32]] df = pd.DataFrame(data1, index=['Á¦·Î', 'Çϳª', 'µÑ'], columns=['a', 'b', 'c']) df0 = df.loc['Á¦·Î', 'a'] df1 = df.iloc[0, 1] df2 = df.loc['Á¦·Î', ['a', 'c']] df3 = df.loc['Á¦·Î', 'a': 'c'] df4 = df.iloc[2, 0: 3] print(df0) print(df1) print(df2) print("slicing") print(df3) print(df4) °á°ú) 10 20 a 10 c 30 Name: Á¦·Î, dtype: int64 slicing a 10 b 20 c 30 Name: Á¦·Î, dtype: int64 a 12 b 22 c 32 Name: µÑ, dtype: int64 ƯÁ¤ Ä®·³À» dataframeÀ¸·Î º¸´Â ¹æ¹ýÀº ´ÙÀ½ÀÇ ¼¼°¡Áö°¡ ÀÖ´Ù. df[['a', 'c']] df.loc[:, ['a', 'c']] df.iloc[:, [0, 2]] °°Àº °á°ú·Î ÁêÇÇÅÍ ³ëÆ®ºÏ¿¡¼ º¸¸é ´ÙÀ½°ú °°´Ù. |