python读文件判断是否已到EOF

python读文件判断是否已到EOF,也即结尾，一般其它语言都是以EOF直接来判断的，比如 if ( fp.read(chunk_size) == EOF),

但python到结尾后是返回空字符串的，所以python可以这样判断：

fp = open('path/to/file', 'r', encoding='utf-8')
str = ''
try:
    while True:
        s = fp.read(10)
        if s == '':
            break
        str += s
finally:
    fp.close()

print(str)

或用with 代替 try

str = ''
with open('readme.txt', 'r', encoding='utf-8') as fp:
    while True:
        s = fp.read(10)
        if s == '':
            break
        str += s
print(str)