在一次采訪中,一位采訪者問我為什么readline()比Python中的readlines()慢得多？

我回答說readlines()需要多次閱讀,這需要更多的支出.

我不知道我的答案是否正確.

如果我的答案是正確的,那么支出是多少？

謝謝！

PS：我知道readline()和readlines()之間的區別！

readlines()一次讀取整個文件,readline()只能讀取一行.

我希望有人能告訴我一些關于磁盤IO文件的知識.

解決方法:

f.readline() reads a single line from the file; a newline character

(\n) is left at the end of the string, and is only omitted on the last

line of the file if the file doesn’t end in a newline.

Read one entire line from the file. A trailing newline character is

kept in the string (but may be absent when a file ends with an

incomplete line). If the size argument is present and

non-negative, it is a maximum byte count (including the trailing

newline) and an incomplete line may be returned. When size is not 0,

an empty string is returned only when EOF is encountered immediately.

If you want to read all the lines of a file in a list you can also use

list(f) or f.readlines().

Read until EOF using readline() and return a list containing the lines

thus read. If the optional sizehint argument is present, instead of

reading up to EOF, whole lines totalling approximately sizehint bytes

(possibly after rounding up to an internal buffer size) are read.

Objects implementing a file-like interface may choose to ignore

sizehint if it cannot be implemented, or cannot be implemented

efficiently.

因此readlines使用readline函數“多次讀取”文件.其他答案可以更詳細地回答每個答案的表現.

標簽：python

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