Python 文件操作大全

f = open('d:/MyComputer/text.txt','r')
print(f)  
print(type(f))
"""
运行结果
<_io.TextIOWrapper name='d:/My Computer/text.txt' mode='r' encoding='cp936'>
<class '_io.TextIOWrapper'>
"""

f.close()

# 文件打开的上限  
FIle = []  
count = 0  
while True:  
    f = open('d:/My Computer/text.txt')  
    first.append(f)  
    count += 1  
    print(f'打开文件的个数：{count}')

# 使用 read 方式打开文件，再进行写操作  
f = open('d:/My Computer/text.txt','r')  
f.write('hello')  
f.close()

# 使用 write 来实现写文件的操作  
# 使用 read 方式打开文件，再进行写操作  
f = open('d:/My Computer/text.txt','w')  
f.write('hello')  
f.close()  
f = open('d:/My Computer/text.txt','w')  
f.write('world')  
f.close()

# 使用 read 方式打开文件，再进行写操作  
f = open('d:/My Computer/text.txt','w')  
f.write('hello')  
f.close()  
f = open('d:/My Computer/text.txt','a')  
f.write('world')  
f.close()

# 按字符数量来读取  
f = open('d:/My Computer/text.txt','r',encoding='utf8')  
result = f.read(5)  
print(result)  
f.close()
"""
运行结果
床前明月光
"""

# 按行读取  
f = open('d:/My Computer/text.txt','r',encoding='utf8')  
for line in f:  
    print(f'line = {line}')  
f.close()
"""
运行结果
line = 床前明月光
line = 疑是地上霜
line = 举头望明月
line = 低头思故乡
"""

# 按行读取  
f = open('d:/My Computer/text.txt','r',encoding='utf8')  
for line in f:  
    print(f'line = {line}', end = '')  
f.close()
"""
运行结果
line = 床前明月光
line = 疑是地上霜
line = 举头望明月
line = 低头思故乡
"""

# 直接读完所有内容，并且按行进行组织  
f = open('d:/My Computer/text.txt', 'r', encoding='utf8')  
lines = f.readlines()  
print(lines)  
f.close()
"""
运行结果
['床前明月光\n', '疑是地上霜\n', '举头望明月\n', '低头思故乡']
"""

with open('d:/My Computer/text.txt','r',encoding='utf8') as f:
	# 进行文件处理的逻辑