Python 工具箱
Hugo Bowne-Anderson
Data Scientist at DataCamp
pandas
read_csv()
chunksize
import pandas as pd result = [] for chunk in pd.read_csv('data.csv', chunksize=1000): result.append(sum(chunk['x'])) total = sum(result) print(total)
import pandas as pd result = []
for chunk in pd.read_csv('data.csv', chunksize=1000):
result.append(sum(chunk['x']))
total = sum(result)
print(total)
4252532
import pandas as pd total = 0 for chunk in pd.read_csv('data.csv', chunksize=1000): total += sum(chunk['x']) print(total)
import pandas as pd total = 0
for chunk in pd.read_csv('data.csv', chunksize=1000): total += sum(chunk['x'])
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