输入输出.格式操作
1.\r,把光标移动到行首不换行(比较经典的还是写进度条)
# -*- coding: utf-8 -*-
"""
#
# Authors: limanman
# OsChina: http://my.oschina.net/pydevops/
# Purpose:
#
"""
import sys
import time
import blessings
def main():
"""Main function."""
char_num = 1
fillchar = '#'
cur_progress = ''
sharp_list = ['-', '\\', '|', '/']
# sharp width and percent width
sharp_width = percent_width = 3
pre_progress_width = int(TERMINAL.width)
while True:
# real-time change length of the tty width and height
progress_width = int(TERMINAL.width)
delta_width = progress_width - pre_progress_width
chars_width = progress_width - sharp_width - percent_width - 3
# flush current line
if delta_width != 0:
sys.stdout.write('%s\r' % (' '*progress_width))
sys.stdout.flush()
cur_percent = float(char_num) / chars_width
cur_charnum = int(round(char_num*cur_percent))
if cur_charnum <= char_num:
char_num += 1
else:
break
cur_sharp = sharp_list[char_num % len(sharp_list)]
cur_progress = fillchar * cur_charnum
sys.stdout.write('%-*s%-*s %*d%%\r' % (
sharp_width,
'[{0}]'.format(TERMINAL.red(cur_sharp)),
chars_width, cur_progress,
percent_width, int(round(cur_percent*100))))
sys.stdout.flush()
time.sleep(0.1)
pre_progress_width = progress_width
if __name__ == '__main__':
TERMINAL = blessings.Terminal()
main()
print
2.\b,退格键,把输出的光标往回退(比较经典的还是写进度条)
3.\n,换行
4.%s,优先用str()函数进行字符串转换
5.%d,转换对象为有符号的十进制数
6.%o,转换对象为无符号的八进制数
7.%x,转换对象为无符号十六进制数
8.#,在八进制前面显示0,十六进制前面显示0x/X,例%#x,%#o
9.%f,转换对象为浮点型(小数部分自然阶段)
10.-,左对齐,例如%-15s左对齐15个长度
11.+,在正数前面显示加号,例如%+10d,正数前会多一个+号
12.0,在显示的数字前面填充0,例%04d不够4个长度0填充
13.%%,输出一个单一的百分号%,例%%,常用百分比输出
14.(var),例%(hobby)s,后面对应的必须是一个字典
16.m.n,m是显示的最小的总宽度,n是小数点儿后的位数(如果可用的话),可以使用*号作为字段宽度或是精度(或者两者都使用*),此时数值会从元祖参数中读取
# -*- coding: utf-8 -*-
"""
#
# Authors: limanman
# OsChina: http://my.oschina.net/pydevops/
# Purpose:
#
"""
import blessings
def main():
"""Main function."""
price_width = 10
# get total width
total_width = int(raw_input('please enter the width: '))
if total_width >= TERMINAL.width:
total_width = TERMINAL.width - 2
items_width = total_width - price_width
head_format = '%-*s%-*s'
item_format = '%-*s%-*.2f'
# print header
print total_width * '='
print head_format % (items_width, 'Items', price_width, 'Price')
print total_width * '='
# print items
print item_format % (items_width, 'Linux', price_width, 4999)
print item_format % (items_width, 'Python', price_width, 5000)
if __name__ == '__main__':
TERMINAL = blessings.Terminal()
main()