Add missing docstrings.

This commit is contained in:
Raymond Hettinger 2004-03-14 07:54:37 +00:00
parent 0e91643bd2
commit deb4da500b
1 changed files with 67 additions and 0 deletions

View File

@ -66,6 +66,12 @@ class StringIO:
return self
def next(self):
"""A file object is its own iterator, for example iter(f) returns f
(unless f is closed). When a file is used as an iterator, typically
in a for loop (for example, for line in f: print line), the next()
method is called repeatedly. This method returns the next input line,
or raises StopIteration when EOF is hit.
"""
if self.closed:
raise StopIteration
r = self.readline()
@ -81,10 +87,21 @@ class StringIO:
del self.buf, self.pos
def isatty(self):
"""Returns False because StringIO objects are not connected to a
tty-like device.
"""
_complain_ifclosed(self.closed)
return False
def seek(self, pos, mode = 0):
"""Set the file's current position.
The mode argument is optional and defaults to 0 (absolute file
positioning); other values are 1 (seek relative to the current
position) and 2 (seek relative to the file's end).
There is no return value.
"""
_complain_ifclosed(self.closed)
if self.buflist:
self.buf += ''.join(self.buflist)
@ -96,10 +113,18 @@ class StringIO:
self.pos = max(0, pos)
def tell(self):
"""Return the file's current position."""
_complain_ifclosed(self.closed)
return self.pos
def read(self, n = -1):
"""Read at most size bytes from the file
(less if the read hits EOF before obtaining size bytes).
If the size argument is negative or omitted, read all data until EOF
is reached. The bytes are returned as a string object. An empty
string is returned when EOF is encountered immediately.
"""
_complain_ifclosed(self.closed)
if self.buflist:
self.buf += ''.join(self.buflist)
@ -113,6 +138,18 @@ class StringIO:
return r
def readline(self, length=None):
"""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.
An empty string is returned only when EOF is encountered immediately.
Note: Unlike stdio's fgets(), the returned string contains null
characters ('\0') if they occurred in the input.
"""
_complain_ifclosed(self.closed)
if self.buflist:
self.buf += ''.join(self.buflist)
@ -130,6 +167,13 @@ class StringIO:
return r
def readlines(self, sizehint = 0):
"""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 (or more
to accommodate a final whole line).
"""
total = 0
lines = []
line = self.readline()
@ -142,6 +186,16 @@ class StringIO:
return lines
def truncate(self, size=None):
"""Truncate the file's size.
If the optional size argument is present, the file is truncated to
(at most) that size. The size defaults to the current position.
The current file position is not changed unless the position
is beyond the new file size.
If the specified size exceeds the file's current size, the
file remains unchanged.
"""
_complain_ifclosed(self.closed)
if size is None:
size = self.pos
@ -152,6 +206,10 @@ class StringIO:
self.buf = self.getvalue()[:size]
def write(self, s):
"""Write a string to the file.
There is no return value.
"""
_complain_ifclosed(self.closed)
if not s: return
# Force s to be a string or unicode
@ -179,11 +237,20 @@ class StringIO:
self.pos = newpos
def writelines(self, iterable):
"""Write a sequence of strings to the file. The sequence can be any
iterable object producing strings, typically a list of strings. There
is no return value.
(The name is intended to match readlines(); writelines() does not add
line separators.)
"""
write = self.write
for line in iterable:
write(line)
def flush(self):
"""Flush the internal buffer
"""
_complain_ifclosed(self.closed)
def getvalue(self):