python十以内加减法_python生成PDF文件20以内加减法，给上小学的宝宝

# -*- coding: utf-8 -*-

import random

from reportlab import platypus

from reportlab.lib.units import inch

from reportlab.lib.pagesizes import A4, landscape #最后生成横向打印的PDF

from reportlab.lib import colors

def genList():

ret = set()

while True:

a = random.randint(1, 20)

b = random.randint(1, 20)

c = random.randint(1, 20)

if a + b + c <= 20 and (a > 10 or b > 10 or c > 10):

ret.add( '%-2d + %-2d + %-2d =' % (a, b, c) )

if len(ret) == 25: break

while True:

a = random.randint(1, 20)

b = random.randint(1, 20)

c = random.randint(1, 20)

if a + b <= 20 and a + b - c >= 0 and (a > 10 or b > 10 or c > 10):

ret.add( '%-2d + %-2d - %-2d =' % (a, b, c) )

if len(ret) == 50: break

while True:

a = random.randint(1, 20)

b = random.randint(1, 20)

c = random.randint(1, 20)

if a - b >= 0 and a - b + c <= 20 and (a > 10 or b > 10 or c > 10):

ret.add( '%-2d - %-2d + %-2d =' % (a, b, c) )

if len(ret) == 75: break

while True:

a = random.randint(11, 20)

b = random.randint(1, 20)

c = random.randint(1, 20)

if a - b - c >= 0 and (a > 10 or b > 10 or c > 10):

ret.add( '%-2d - %-2d - %-2d =' % (a, b, c) )

if len(ret) == 100: break

ret = list(ret)

random.shuffle(ret)

return ret

'''for i in genList():

print i'''

def genTable():

data = []

items = genList()

for i in range(0, len(items), 5):

data.append(items[i:i+5])

# Courier 是 reportlab 缺省定义的等宽字体

# (0,0)/(-1,-1)说的是style运用范围，从左上到右下

tablestyle = [('FONT', (0,0), (-1,-1), 'Courier', 12),

('LINEAFTER', (0,0), (-2,-1), 1, colors.black)]

return platypus.Table(data, 2.2*inch, 0.35*inch, tablestyle)

import sys

try:

n = int(sys.argv[1]) #恩恩，生成一个多页的PDF

except:

n = 1

try:

fname = sys.argv[2]

except:

fname = '20plus100.pdf'

doc = platypus.SimpleDocTemplate(fname, topMargin=0.5*inch, bottomMargin=0.5*inch, title='DaDa Math', author='qyb')

elements = []

for i in range(n):

elements.append(genTable())

elements.append(platypus.flowables.PageBreak())

doc.pagesize = landscape(A4)

doc.build(elements)

这个 功能需要用到python  的reportlab  包，，请下载安装

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2009-12-24 16:00

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