上下文
I’ve learned在Python中读取文件时应该使用open:
import csv
with open('employee_birthday.txt') as csv_file:
csv_reader = csv.reader(csv_file, delimiter=',')
line_count = 0
for row in csv_reader:
if line_count == 0:
print(f'Column names are {", ".join(row)}')
line_count += 1
else:
print(f'\t{row[0]} works in the {row[1]} department, and was born in {row[2]}.')
line_count += 1
print(f'Processed {line_count} lines.')
(source)
但是,我已经看到了使用pandas的pd.read_csv时未使用此结构的多个示例:
# Load the Pandas libraries with alias 'pd'
import pandas as pd
# Read data from file 'filename.csv'
# (in the same directory that your python process is based)
# Control delimiters, rows, column names with read_csv (see later)
data = pd.read_csv("filename.csv")
# Preview the first 5 lines of the loaded data
data.head()
(source)
题
➥我应该使用open():当使用pandas的pd.read_csv读取.csv文件时?
(或者pd.read_csv已经够聪明了吗?)
最佳答案 使用open(‘<>‘)作为file:方法允许用户需要对文件中的单行或多行进行逐行操作.
pandas处理文件的方式不同.将文件导入到pandas dataframe时,它会将文件的全部内容导入到dataframe中.不需要指定打开和关闭文件,因为您将在那里处理数据框.
因此,当您将文件读取到pandas数据帧时,不需要使用open().