Python实用技巧之临时文件的妙用

import os
import tempfile

with tempfile.TemporaryFile() as f:
    print(f.name)
    print(os.path.exists(f.name))

print(os.path.exists(f.name))

raw_string='''a,b,c
1,1,1
2,2,2
3,3,3
4,4,4
'''

with tempfile.TemporaryFile('w+') as f:
    f.write(raw_string)
    f.seek(0) #将指针移回文件开头
    
    demo_df=pd.read_CSV(f)
    
demo_df

with tempfile.TemporaryDirectory() as p:
    
    print(p)
    print(os.path.exists(p))
    
print(os.path.exists(p))

import shutil
import zipfile
import numpy as np

with tempfile.TemporaryDirectory() as p:
    
    # 模拟向当前临时目录下写出多个文件
    for i in range(100):
        (
            pd
            .DataFrame(np.random.rand(10, 3), columns=list('ABC'))
            .to_csv(os.path.join(p, f'demo{i+1}.csv'), index=False)
        )
        
    # 将当前临时目录转为zip压缩包
    shutil.make_arcHive('./demo', 'zip', p)

# 查看目标压缩文件内的文件
[file.filename for file in zipfile.ZipFile('demo.zip').filelist]