| CARVIEW |
?mpandas??????nSeries?I?u?W?F?N?g?̍쐬?Ƃ??̊?{?FPython?f?[?^?????????i1/2 ?y?[?W?j
pandas??????f?[?^???i?[?^???삷?邽?߂?2??ނ̃I?u?W?F?N?g?ASeries??DataFrame?B???̂?????Series?I?u?W?F?N?g???쐬???Ȃ???A???̊?{?I?ȓ??????Љ?B
?{?V???[?Y?Ɩ{?A?ڂɂ???
?@?{?V???[?Y?uPython?f?[?^????????v?́APython?̊?b???}?X?^?[?????l??ΏۂɈȉ??̂悤?ȁAPython???g???ăf?[?^?????????悤?Ƃ????Ƃ??ɕ֗??Ɏg????c?[????C?u?????A?t???[?????[?N?̎g?????̊?b???????????̂ł??B
- NumPy?i?uNumPy??????v?̖ڎ??????????j
- pandas?i?{?A?ځj
- Matplotlib
?@Python???????o????Ή??ł??ł???킯?ł͂Ȃ??A?Ƃ????̂̓n?[?h???????????????邩??????܂???B????ł??v???O???~???O????Ɋւ????b???g?ɕt??????A??͊e?c?[?????g???Ȃ???A????ƃc?[???ɑ??闝???????????A????????Ɛ[?߂Ă??????ƂŎ????????邱?Ƃ??????Ă????܂??B???̂???`?????ł????炢???ȁA?Ƃ????̂??{?V???[?Y?̖ړI?Ƃ???Ƃ???ł??B
?@?Ȃ??A?{?A?ڂł͈ȉ??̃o?[?W???????g?p???Ă??܂??B
- Python 3.12
- pandas 2.2.1
Series?I?u?W?F?N?g?Ƃ?
?@pandas.Series?N???X?i?ȉ??ASeries?N???X?j?̓C???f?b?N?X?t????1?????z???\???N???X?ł??B
?@?ȉ??ł?Series?I?u?W?F?N?g???쐬???Ȃ???A???̓????ɂ??Č??Ă????܂??傤?B
pandas.Series?R???X?g???N?^
pandas.Series(data=None, index=None, dtype=None, name=None, copy=None)
?@1?????z??ł???Series?N???X?̃C???X?^???X??????B?p?????[?^?[?̈Ӗ??͎??̒ʂ?B
- data?FSeries?I?u?W?F?N?g?Ɋi?[????f?[?^???w??B???X?g?A1?????z??A?????A?X?J???[?l?Ȃǂ??w??\?B?ȗ????̃f?t?H???g?l??None?ŁA???̂Ƃ??ɂ͋??Series?I?u?W?F?N?g???????????
- index?FSeries?I?u?W?F?N?g?̗v?f?ւ̃A?N?Z?X?Ɏg?p????C???f?b?N?X?̎w??B???X?g??NumPy??ndarray????Series?I?u?W?F?N?g??????ꍇ?ɂ́A?C???f?b?N?X?̐??ƌ??f?[?^?̗v?f???͓????łȂ???Ȃ?Ȃ??B?ȗ????̃f?t?H???g?l??None?ŁA???̂Ƃ??ɂ͐????x?[?X?̃C???f?b?N?X?ƂȂ?
- dtype?FSeries?I?u?W?F?N?g?̗v?f?̃f?[?^?^?B?ȗ????̃f?t?H???g?l??None?ŁA???̂Ƃ??ɂ?data?p?????[?^?[?Ɏw?肵?????̂???f?[?^?^???????????
- name?FSeries?I?u?W?F?N?g?̖??O?B?ȗ????̃f?t?H???g?l??None
- copy?Fdata?p?????[?^?[?Ɏw?肵???f?[?^?̃R?s?[??Series?I?u?W?F?N?g?Ɋi?[???邩?ǂ????̎w??BTrue?̓R?s?[????BFalse?̓R?s?[???Ȃ??B?ȗ????̃f?t?H???g?l??False
?V???v???ȍ쐬??
?@?ł??ȒP?ȗ?Ƃ??ẮA???X?g??NumPy??1?????z??indarray?j??n???????Ƃ????̂??l?????܂??B?ȉ???NumPy??1?????z?? ??n????ł??i???ɂ???Ă?dtype?̒l???o?͌??ʂƈقȂ?ꍇ??????܂??j?B
import pandas as pd
import numpy as np
a = np.array([0.81, 0.66, 0.78, 0.09, 0.31])
print(a) # [0.81 0.66 0.78 0.09 0.31]
s = pd.Series(a)
print(s)
# ?o?͌??ʁF
#0 0.81
#1 0.66
#2 0.78
#3 0.09
#4 0.31
#dtype: float64
?@Visual Studio Code?i??Python?g???@?\??Jupyter?g???@?\???C???X?g?[????????ԁB?ȉ??AVS Code?j?ŏ?L?R?[?h?????s???????ʂ??ȉ??Ɏ????܂??B
?@?ϐ?s?ɑ??????Series?I?u?W?F?N?g??print???ŏo?͂??????ʂ????Ă????????B?????̗?͖`???ŏq?ׂ??u?????x???i?C???f?b?N?X?j?v?ł??B?????ĉE???ɁA???̃C???f?b?N?X?ɑΉ?????l???\??????Ă??܂??B?u?????x???v?͍s???????ʂ??邽?߂Ɏg???郉?x???̂??ƂŁA?s?̏ꍇ?͓??Ɂu?C???f?b?N?X?v?ƌĂ?܂??B??̗?Ŏ??グ?Ă???̂?Series?I?u?W?F?N?g?ł???A?????x???i?C???f?b?N?X?j?Ƃ??Ă͐??????g???Ă??܂????A?ȉ??Ŏ????悤?ɕ???????w?肷?邱?Ƃ??\?ł??B
?@?܂??A?ʼn??s?Ɂudtype: float64?v?Ƃ??邱?ƂɋC???t??????????????????ł??傤?B????͂???Series?I?u?W?F?N?g???i?[???Ă???f?[?^?̌^??float64?i64bit?̕????????_???l?j?ł??邱?Ƃ??Ӗ????Ă??܂??B??قǂ?pandas.Series?R???X?g???N?^?̍\???Ɏ??????悤?ɁAdtype?p?????[?^?[?Ƀf?[?^?^???w?肷?邱?ƂŁA?ǂ̌^?̃f?[?^???i?[???邩?????邱?Ƃ??\?ł??idtype?p?????[?^?[?ɂ??Ă͌?q???܂??j?B
?@index?p?????[?^?[???w?肵?Ȃ??????ꍇ?A?????x?? ?͏?̉摜???番????悤?ɐ????̃C???f?b?N?X?ƂȂ?܂??B?????x?? ?ɂ́A?n?b?V???\?Ȓl?i?I?u?W?F?N?g?????݂???ԁA??ɓ???̌v?Z???ʂƂȂ?A?????̃I?u?W?F?N?g?̂???Ƃ͏d?????Ȃ??l?j???w??ł??܂????A?????ȊO?̂??̂Ƃ??Ă͕???????w?肷?邱?Ƃ??????Ȃ?ł??傤?B
?@????????Series?I?u?W?F?N?g?̗v?f?ɃA?N?Z?X????ɂ́A???̃C???f?b?N?X???g???܂??B
print(s[1]) # 0.66
?@data?p?????[?^?[?Ɏ?????n???ƁA???̃L?[???????x?? ?ɁA?L?[?ɑΉ?????l?????̃C???f?b?N?X?̒l?ɂȂ?܂??B?ȉ??ɗ???????܂??B
d = {'A': 0.81, 'B': 0.66, 'C': 0.78, 'D': 0.09, 'E': 0.31}
s = pd.Series(d)
print(s)
# ?o?͌??ʁF
#A 0.81
#B 0.66
#C 0.78
#D 0.09
#E 0.31
#dtype: float64
?@VS Code?ŏ?L?R?[?h?????s???????ʂ??ȉ??Ɏ????܂??B
?C???f?b?N?X?Ƃ??ă??x?? ??t???@???x?̓C???f?b?N?X ??'A'?A?fB'?Ȃǂ̕?????ɂȂ??Ă??邱?Ƃɒ??ڂ??Ă????????B????āA????Series?I?u?W?F?N?g?̗v?f?ɃA?N?Z?X????ɂ͂??̃??x?????g???܂??B
print(s['C']) # 0.78
?@?f?[?^?̊i?[???@?̂悤?ȍׂ??Ȃ??Ƃ??C?ɂ??Ȃ???ASeries?I?u?W?F?N?g?͎????̂悤?ɂ??g????Ƃ????邩??????܂???B
print('A' in d) # True
print('A' in s) # True
print(d['F']) # KeyError
print(s['F']) # KeyError
print(d.get('F', np.nan)) # nan
print(s.get('F', np.nan)) # nan
index?p?????[?^?[???w?肷??
?@??̗?ł͎?????n?????ƂŁA?C???f?b?N?X ?Ƃ??ă??x?????t?????ꂽSeries?I?u?W?F?N?g?????܂??????Aindex?p?????[?^?[?Ɍ??f?[?^?Ɠ??????̗v?f???܂ރ??X?g?Ȃǂ?n?????ƂŁA???x???t????Series?I?u?W?F?N?g?Ƃ??邱?Ƃ??\?ł??B
s = pd.Series([0, 1, 2], index=list('ABC'))
print(s)
# ?o?͌??ʁF
#A 0
#B 1
#C 2
#dtype: int64
?@?????ł́uindex=list('ABC')?v?Ƃ??Ă??܂????A????͕?????'ABC'???????\?I?u?W?F?N?g?ł??邱?Ƃ𗘗p???āAlist????3?????̕??????1???????ɕ??????A['A', 'B', 'C']?Ƃ??????X?g???쐬???A?????index?p?????[?^?[?ɓn?????Ƃ??Ӗ????Ă??܂??B???̌??ʁA??̏o?͌??ʂ̂悤?ɃC???f?b?N?X?????????Series?I?u?W?F?N?g??????????Ă??܂??B
?@?Ȃ??A???X?g??NumPy??ndarray????Series?I?u?W?F?N?g??????Ƃ??ɂ́Aindex?p?????[?^?[?Ɏw?肷??C???f?b?N?X?̐??͌??f?[?^?̗v?f?̐??ɍ??킹??K?v??????܂??B
s = pd.Series([0, 1, 2], index=list('ABCD')) # ValueError
?@?Ⴆ?A??̃R?[?h?ł̓??X?g?̗v?f????3?Aindex?p?????[?^?[?ɗ^???????X?g?̗v?f????4?ƁA??v???Ă??Ȃ??̂?ValueError??O?????????܂??B
?@?ł́Aindex?p?????[?^?[?Ń??x?????w?肷??̂Ɠ????ɁA??????n???Ƃǂ??Ȃ?ł??傤?B?܂??A???f?[?^?̗v?f???ƃC???f?b?N?X?̐?????v???Ă???ꍇ?ł??B
d = {'A': 0, 'B': 1, 'C': 2}
s = pd.Series(d, index=list('BAC'))
print(s)
?@???̏ꍇ?͂???????肠??܂???BVS Code?ł??̃R?[?h?????s???????ʂ??ȉ??Ɏ????܂??B
index?p?????[?^?[?Ɏw?肵???????ɍs??????ł????@???????Aindex?p?????[?^?[?ɂ?list('BAC')?܂?['B', 'A', 'C']??n???Ă??܂??B?????āA?v?f?̕??я???????ɉ????????̂ɂȂ??Ă??邱?Ƃ???????܂??B????͂܂?Aindex?p?????[?^?[?̎w??ɂ???āA?v?f???ǂ̂悤?ɕ??ׂ邩???ł???Ƃ??????Ƃł??B???炩?̗??R?ŁA?????Ɋ܂܂??v?f?̕??я???Series?̗v?f?̕??я???ς??????Ƃ??ɂ͂?????g????ł??傤?B
?@???ɁAindex?p?????[?^?[?Ɏ????ɂ͑??݂??Ȃ??L?[?????x???Ƃ??Ċ܂߂?Ƃǂ??Ȃ?ł??傤?B
d = {'A': 0, 'B': 1, 'C': 2}
s = pd.Series(d, index=list('DBCA'))
print(s)
?@?????ł?index?p?????[?^?[?ɂ?['D', 'B', 'C', 'A']??n???Ă??܂??B?????āA'D'???L?[?Ƃ???l?͎???d?ɂ͊܂܂?Ă??܂???B???̃R?[?h?????s????Ǝ??̂悤?ɂȂ?܂??B
?????Ɋ܂܂?Ȃ????̂ɂ??ẮA???????Ă??邱?Ƃ?????NaN???l?ɂȂ??@???x???Ɋ܂߂?'D'?ɑΉ?????l???A????d?ɂ͊܂܂?Ă??Ȃ??_?ɒ??ӂ??Ă????????Bndarray??X?g????Series?I?u?W?F?N?g???쐬????Ƃ??ɂ?index?p?????[?^?[?ɗ^???郊?X?g?̗v?f???ƁAdata?p?????[?^?[?ɓn?????f?[?^?̐?????v????K?v??????܂????A?????̏ꍇ?͓????łȂ??Ă??\???܂???B??????n?????ꍇ?A?????????Series?I?u?W?F?N?g?ɂ̓??x??'D'?ɑΉ?????v?f???܂܂??悤?ɂȂ?̂ł????A???̒l?̓f?[?^?????????Ă??邱?Ƃ?????NaN?ɂȂ??Ă??܂??B
?@?Ȃ??Apandas.Series?R???X?g???N?^??data?p?????[?^?[?ɃX?J???[?l??n?????ꍇ?ɂ́Aindex?p?????[?^?[?̎w??͕K?{?ł??B?????āA???̂Ƃ??ɂ?index?p?????[?^?[?ɓn?????C???f?b?N?X?̐???v?f???Ƃ???Series?I?u?W?F?N?g???쐬????A?S?Ă̗v?f?̒l??data?p?????[?^?[?ɓn?????X?J???[?l?ƂȂ?܂??B?ȉ??ɗ???????܂??B
s = pd.Series(42, index=range(5))
print(s)
# ?o?͌??ʁF
#0 42
#1 42
#2 42
#3 42
#4 42
?@???̗?ł?index?p?????[?^?[?ɂ?range(5)??n???Ă??܂??Brange(5)?͔????\?I?u?W?F?N?g?ł?????0?A1?A2?A3?A4?????ĕԂ??܂??B?????āA????炪?C???f?b?N?X?Ƃ??Ďg???Adata?p?????[?^?[?Ɏw?肵??42???S?Ă̗v?f?̒l?Ƃ???Series?I?u?W?F?N?g??????????Ă???킯?ł??BSeries?I?u?W?F?N?g?̑S?v?f???????l?ƂȂ?悤?ɏ????????????Ƃ??ɂ́A???̕??@?ŃI?u?W?F?N?g??????Ƃ悢?ł??傤?i???̏ꍇ?Ȃ?upd.Series?i[42] * 5?j?v?ł??悢?ł??傤????ǁj?B
copy?p?????[?^?[?̎w??
?@copy?p?????[?^?[?ɂ̓u?[???A???l?iTrue??False?j???w?肵?܂??BTrue?̏ꍇ?́Adata?p?????[?^?[?ɓn???????f?[?^???R?s?[????āA?????????Series?I?u?W?F?N?g?Ɋi?[????܂??BFalse???w?肵???ꍇ?A?R?s?[????܂???i?f?t?H???g?̓???j?B?Ȃ??A?????data?p?????[?^?[??NumPy??ndarray??Apandas??Series?I?u?W?F?N?g??n?????ꍇ?̓???ɂȂ?܂??B
?@copy?p?????[?^?[?̏ȗ????̓???́u???f?[?^???R?s?[???Ȃ??v?ł??B????͂܂?A???f?[?^??Series?I?u?W?F?N?g?Ńf?[?^?????L?????Ƃ??????Ƃł??B???̂??߁A????Ńf?[?^??ύX????ƁA???ꂪ????????ɂ??e?????܂??B?ȉ??ɗ???????܂??B
a = np.array([0, 1, 2]) # NumPy??ndarray?I?u?W?F?N?g??
s = pd.Series(a) # copy=False
s[1] = 10
print(s)
# ?o?͌??ʁF
#0 0
#1 10
#2 2
print(a) # [0 10 2]
?@???̗?ł?pandas.Series?R???X?g???N?^?Ăяo???̍ۂɁAdata?p?????[?^?[?ɂ?NumPy??ndarray?I?u?W?F?N?g??n???Ă??܂??B?????āAcopy?p?????[?^?[?̎w??͏ȗ????Ă???̂ŁA?R?s?[?͔??????܂???B?????āA???????ꂽSeries?I?u?W?F?N?g?̗v?f??ύX???Ă???ASeries?I?u?W?F?N?g??ndarray?I?u?W?F?N?g?̒l??\?????Ă???̂ł????ASeries?I?u?W?F?N?g?ɑ??čs?????l?̕ύX??ndarray?I?u?W?F?N?g?ɂ??`????Ă??邱?Ƃ???????܂??B?????????????𗝉????Ă????Ȃ??ƁA????Ă???????ɒɂ??ڂɑ???????????Ȃ??̂œ??ɂ͓???Ă????܂??傤?B
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