【python入门】python基础10——文件读写操作，open read write close，with方法_txt.close()

文件读写：

open（‘ xxx '）

open（‘ xxx’,'w'）

.read()

.write()

.close()

最后一定要关闭文件，不然可能会有问题，存在数据丢失

法1：

with open('a.txt','w') as f:

    f.write('abc')

法2：

txt = open('a.txt','w')

try:

    txt.write('abc'+'\n')

except Exception:

    print('error')

finally:

    txt.close()

txt = open('./data/a.txt')

txt_read = txt.read()

print(txt_read)

txt.close()

txt = open('a.txt')
txt_lines = txt.readlines()
print(txt_lines)
for line in txt_lines:
    print(line)

txt.close()

txt = open('a.txt','w') ##覆盖
txt.write('jintian qianqi bucuo \n')
txt.write('hhhhhhhhhhhhhhhhhhhh \n')
txt.close()
txt = open('a.txt')
txt_read = txt.read()
print(txt_read)

txt.close()

txt = open('a.txt','a')  ##追加
txt.write('jintian qianqi bucuo \n')
txt.write('hhhhhhhhhhhhhhhhhhhh \n')
txt.close()
txt = open('a.txt')
txt_read = txt.read()
print(txt_read)
txt.close()