我有一个对象列表，我想在一个漂亮的表中打印每个对象的参数。
我的代码在这里：
class item(object):
def __init__(self, thing, owner, color):
self.thing = thing
self.owner = owner
self.color = color
bin = []
bin.append(item('shirt', 'John', 'red'))
bin.append(item('skirt', 'Jane', 'blue'))
## Need help here
## Can't figure this out
print '%-10s %-10s %-10s' % (bin[0].thing, bin[0].owner, bin[0].color)
我想要得到的输出是
shirt skirt
John Jane
red blue
这是我很久以前发现的东西，它非常有用并且仍然有效。我最近终于开始让它与大多数最新的 Py 2.7.x 和 3.x 标准保持同步，尽管大多数更改都是我所说的装饰性和/或相当微不足道的。
# File: textformatter.py
# Author: Hamish B Lawson
# Date: 19 Nov 1999
# from http://www.faqts.com/knowledge_base/view.phtml/aid/4517
# Viewable via Internet Archive WayBackMachine:
# https://web.archive.org/web/20080709071216/http://www.faqts.com/knowledge_base/view.phtml/aid/4517
"""
Here is TextFormatter, a simple module for formatting text into
columns of specified widths. It does multiline wrapping and supports
LEFT, CENTER (or CENTRE), and RIGHT alignment.
Revisions:
SKWM Made filling & padding optional, tweaked some edge cases.
MRM Removed import of deprecated string module, made all classes
explicitly new style, capitalized public constants, updated
documentation. Tweaked test() function.
MRM Modified to work in both Python 2.7 and 3.x.
"""
from __future__ import print_function
LEFT, CENTER, RIGHT = range(3)
CENTRE = CENTER
class TextFormatter(object):
"""
Formats text into columns.
Constructor takes a list of dictionaries that each specify the
properties for a column. Dictionary entries can be:
'width' : the width within which the text will be wrapped
'alignment' : LEFT | CENTER | RIGHT
'margin' : number of space characters to prefix in front of column
The compose() method takes a list of strings and returns a formatted
string consisting of each string wrapped within its respective column.
Example:
import textformatter
formatter = textformatter.TextFormatter(
(
{'width': 10},
{'width': 12, 'margin': 4},
{'width': 20, 'margin': 8, 'alignment': textformatter.RIGHT},
)
)
print(formatter.compose(
(
"A rather short paragraph",
"Here is a paragraph containing a veryveryverylongwordindeed.",
"And now for something on the right-hand side.",
)
))
gives:
A rather Here is a And now for
short paragraph something on the
paragraph containing a right-hand side.
veryveryvery
longwordinde
ed.
"""
class Column(object):
def __init__(self, width=75, alignment=LEFT, margin=0, fill=1, pad=1):
self.width = width
self.alignment = alignment
self.margin = margin
self.fill = fill
self.pad = pad
self.lines = []
def align(self, line):
if self.alignment == CENTER:
return line.center(self.width)
elif self.alignment == RIGHT:
return line.rjust(self.width)
else:
if self.pad:
return line.ljust(self.width)
else:
return line
def wrap(self, text):
self.lines = []
words = []
if self.fill: # SKWM
for word in text.split():
wordlen = len(word)
if wordlen <= self.width: # fixed MRM
words.append(word)
else:
for i in range(0, wordlen, self.width):
words.append(word[i:i+self.width])
else:
for line in text.split('\n'):
for word in line.split():
for i in range(0, len(word), self.width):
words.append(word[i:i+self.width])
words.append('\n')
if words[-1] == '\n': words.pop() # remove trailing newline
if words:
current = words.pop(0)
for word in words:
increment = 1 + len(word)
if word == '\n':
self.lines.append(self.align(current))
current = ''
elif len(current) + increment > self.width:
self.lines.append(self.align(current))
current = word
else:
if current:
current = current + ' ' + word
else:
current = word
if current: self.lines.append(self.align(current))
def getline(self, index):
if index < len(self.lines):
return ' '*self.margin + self.lines[index]
else:
if self.pad:
return ' ' * (self.margin + self.width)
else:
return ''
def numlines(self):
return len(self.lines)
def __init__(self, colspeclist):
self.columns = []
for colspec in colspeclist:
self.columns.append(TextFormatter.Column(**colspec))
def compose(self, textlist):
numlines = 0
textlist = list(textlist)
if len(textlist) != len(self.columns):
raise IndexError("Number of text items does not match columns")
for text, column in zip(textlist, self.columns):
column.wrap(text)
numlines = max(numlines, column.numlines())
complines = [''] * numlines
for ln in range(numlines):
for column in self.columns:
complines[ln] = complines[ln] + column.getline(ln)
return '\n'.join(complines) + '\n'
def test():
import textformatter
formatter = textformatter.TextFormatter(
(
{'width': 10},
{'width': 12, 'margin': 4, 'fill': 0},
{'width': 20, 'margin': 8, 'alignment': textformatter.RIGHT},
)
)
print(formatter.compose(
(
"A rather short paragraph",
"Here is\na paragraph containing a veryveryverylongwordindeed.",
"And now for something\non the RIGHT-hand side.",
)
)
)
__all__ = [TextFormatter, LEFT, CENTER, CENTRE, RIGHT]
if __name__ == '__main__':
test()
for attr in ('thing', 'owner', 'color'):
for item in bin:
print '%-10s'%getattr(item, attr),
print
使用列表推导更紧凑
for atts in ('thing', 'owner', 'color'):
print ' '.join('%-10s'%getattr(item, attr) for item in bin)