| CARVIEW |
?mPython?N?C?Y?n????????̕??????+=???Z?q?Ō??????????Ȃ́H?@?????Ɨǂ????@???Ă???܂???ˁI?FPython?X?e?b?v?A?b?v?N?C?Y
??????ɂ?+=???Z?q???????āA??????g???A?J???^????2?̕???????????ł??܂???ˁB?ł??A?g???߂??ɂ͒??ӂ??K?v?ł??B????????̕???????T?N?b?ƌ?????????@?A??????܂????H
???̋L???͉??????ł??B????o?^?i?????j????ƑS?Ă????????????܂??B
?y???z
?@?ȉ??̓??X?gwords?Ɋi?[????Ă??镶????v?f?????????āA???̌??ʂ͕ϐ?result?ɑ??????R?[?h???B???̃R?[?h?͉??????邩????ڗđR?ŕ?????₷???Ƃ?????B????????ǂ??L?q???@???l???Ă݂悤?B
words = ['foo', 'bar', 'baz', 'qux', 'quux']
result = ''
for word in words:
result += word
print(result)
?@?ǂ???HP???킳???ł??B
?@?O???́u?O???l???c?c?v?݂????Ȃ??Ƃ??????܂????B???e???????Ă???i?K?ł͂???ȓ????????Ă?????ł???B?ł??A?????L???????J???鍠?ɂ́u??????Ɗ????ˁv?Ɗ????邱?Ƃ??Ȃ??Ȃ??Ă??܂??Ĕ????ɃY?????????̂Ԃ₫?ɂȂ??Ă??܂??܂????B?z???g?A?G?߂?????̂͑????ł??˂??B???̂܂܁A???N???????Ƃ????Ԃɕ??Ă?????ł??傤?B?????????킯?ŁA?ǂ????N?????}???????????ˁi?????牽?ł????߂??Ȃ??????H?j?B
?y?????z
?@?ȉ??ɐ????̃R?[?h????????܂??B
words = ['foo', 'bar', 'baz', 'qux', 'quux']
result = ''.join(words)
print(result)
?@??????ɂ?join???\?b?h??????܂??B????͈????Ƃ??ė^?????????\?I?u?W?F?N?g?̕?????v?f???A???̃??\?b?h?̌Ăяo???Ŏg?p?????????????蕶???Ƃ??Ďg???Č?????????̂ł??B??̃R?[?h??ł́A????u''?v????蕶???Ȃ̂ŁA???ۂɂ̓??X?g?̗v?f?????̂܂܌???????āufoobarbazquxquux?v?Ƃ????????????܂??B
?@???ɂ??????͂???ł??傤???A?????ł͐????Ƃ??ď?̃R?[?h???????܂????B
?y????z
?@??蕶?̃R?[?h?͎??̂悤?Ȃ??̂ł????B
words = ['foo', 'bar', 'baz', 'qux', 'quux']
result = ''
for word in words:
result += word
print(result)
?@+=???Z?q?ɂ?镶????̌????͕?????₷???̂ł????A???_??????܂??BPython?̕?????̓C?~???[?^?u???i?ύX?s?\?j?ȃI?u?W?F?N?g?ł??B?܂?Afor???̒??Łuresult += word?v?s?????s????邽?тɁu?V???ȕ?????I?u?W?F?N?g???쐬????A?ȑO?̕?????͎̂Ă???v?Ƃ?????????I?ȏ??????s???Ă???̂ł??B????͏??????x?̖ʂł????????̏???ʂƂ????ʂł????܂??낵???͂Ȃ??ł??傤?B
?@????Ajoin???\?b?h?ɂ͎??̂悤?ȓ?????????܂??B
- C????Ŏ???????Ă???
- ??????̕?????̒????????炩???ߌv?Z???āA?K?v?ȃ??????????O?Ɋm?ۂ???
- ???̌?A??蕶????X?g?̗v?f???????ɃR?s?[???Ă???
?@????????????????+=???Z?q?ŕ?????????x?????????Ă????????A???????x?^??????????ʂ̗??ʂŌ????I?Ȃ??????Ƃ????܂??B
?@???ۂɎ????Ă݂܂??傤?B??蕶?̃R?[?h?ł͂??̍????????ɂ???????????Ȃ??̂ŁA?ȉ??ł?10???̕?????v?f???????X?g???Ƃ??Č??܂??B
from time import time
words = ['foo'] * 100000
result = ''
st = time()
for word in words:
result += word
ed = time()
print(f'by += op: {ed - st}')
st = time()
result = ''.join(words)
ed = time()
print(f'by join: {ed - st}')
?@?M?҂̎茳?̊??ŁA???̃R?[?h?????s???????ʂ??ȉ??Ɏ????܂??B
?@join???\?b?h???g???????@?????|?I?ɑ??????Ƃ???????܂????B?ł̓??????̏???ʂ͂ǂ??ł??傤???H?@?????ł?Python?ɕW???Y?t??tracemalloc???W???[?????g???Ċm?F???Ă݂܂??B
import tracemalloc
words = ['foo'] * 100000
result = ''
tracemalloc.start()
for word in words:
result += word
mem_size_now, mem_size_peak = tracemalloc.get_traced_memory()
tracemalloc.stop()
print(f'by += op: now {mem_size_now}, peak {mem_size_peak}')
tracemalloc.start()
result = ''.join(words)
mem_size_now, mem_size_peak = tracemalloc.get_traced_memory()
tracemalloc.stop()
print(f'by join: now {mem_size_now}, peak {mem_size_peak}')
?@tracemalloc???W???[????start???̓????????蓖?Ẵg???[?X???J?n???Astop???̓g???[?X???I?????܂??Bget_traced_memory???͊??蓖?Ă?ꂽ???????u???b?N?̌??݂̃T?C?Y?ƍő?̃T?C?Y???擾??????̂ł??B??̃R?[?h?ł́A?????̊????g???āA+=???Z?q?ɂ?镶?????Ŋ??蓖?Ă?ꂽ???????̃T?C?Y?ƁAjoin???\?b?h?ɂ?镶?????Ŋ??蓖?Ă?ꂽ???????̃T?C?Y???m?F???Ă??܂??B
?@???s???ʂ͎??̒ʂ?ł??B
?@???݂̃T?C?Y?͎????悤?Ȃ??̂ɂȂ??Ă??܂??B????͍ŏI?I?Ȍ??ʂ???????????ł??傤?B???????A?ő?T?C?Y??????Ƃ??̍??͗?R?Ƃ??Ă??܂??B+=???Z?q???g?????@?ł́A??????̐????Ɣj???????ꂾ???????s???Ă???Ƃ??????Ƃł??B
?@?Ƃ????킯?ŁA??????????ʂ̖ʂł?join???\?b?h?̕????????I?ł??邱?Ƃ??悭??????܂????B??????̌????ɂ͉\?ł????join???\?b?h???g?????Ƃ??I?X?X?????܂??B
?@???͏?ŋ??????ȊO?̕??@???????Ă݂܂????B?Ⴆ?A???X?g????\?L??W?F?l???[?^????map?????g?????@?Ȃǂ??????ł??i???X?g?̗v?f????????ȊO???ƁAstr???ŗv?f?????邽?߂ɂ??????????@???̂邱?ƂɂȂ?ł??傤?j?B?ł??A?????̕??@?ł??A?ŏI?I??join???\?b?h?Ō??????邱?Ƃɗ??????????Ⴄ??ł???ˁB
?@??????join???\?b?h???g???R?[?h?ɒlj??̏??????????Ƃ????Ӗ??ł́A???s???x?????シ?邱?Ƃ͂Ȃ??ł??傤?B????ɁA??????????ʂ??l????ƁA????join???\?b?h?̓????ł͑S?Ă̗v?f??????????擾???Ȃ??ƁA?ŏI?I?ȕ?????̃T?C?Y????????܂???B?Ȃ̂ŁA?W?F?l???[?^????map???Ń?????????ʂ?}????Ƃ??????肪?????ł??Ȃ????ʂɂȂ??Ă??܂??܂????B???̂??߂ɏ??????R?[?h?͂????ɂ͓o?ꂵ?܂???iSSD?̃S?~?Ƃ??Ăǂ????ɃK?x?[?W?R???N?V????????܂????j?B
?@?????̂?????͂??????ł??????Ă݂Ă????????B?????āA?u?????ƌ????I?ȕ??@???????I?v?Ƃ??????͂??Ђ??̕??@???????Ă????ƍK???ł??i????͋L???ւ̃????N?͂Ȃ??ł??B?֘A?????肻???ȋL?????v???t???܂???ł????j?B
?uPython?X?e?b?v?A?b?v?N?C?Y?v
AI?E?f?[?^?T?C?G???X?̊w?т?????????
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