四则运算生成器

　　做本次实验时，初学Python，参考网上的代码，用Python写了一个

-- coding:utf-8 --
from random import randint
sym = [' + ', ' - ']
fobj = open('math.txt', 'w')
def base_exei_oneline(pmin, pmax, mmin, mmax, multimin, multimax, divmin, divmax): ''' pmin,pmax:加数、被加数最小最大值 mmin,mmax:减法转换成加法后，加数、被加数最小最大值 multimin,multimax:乘数、被乘数最小最大值 divmin,divmax:除法转换成乘法后，乘数、被乘数最小最大值 '''

plus = str(randint(pmin, pmax)).rjust(2) + ' + ' + str(randint(pmin, pmax)).rjust(2) + ' ='

minus1 = randint(mmin, mmax)
minus2 = randint(mmin, mmax)
minussum = minus1 + minus2
minus = str(minussum).rjust(2) + ' - ' + str(minus1).rjust(2) + ' ='


multi1 = randint(multimin, multimax)
multi2 = randint(multimin, multimax)
multi = str(multi1).rjust(2) + ' x ' + str(multi2).rjust(2) + ' ='


div1 = randint(divmin, divmax)
div2 = randint(divmin, divmax)
divmulti = div1 * div2
div = str(divmulti).rjust(2) + ' /' + str(div1).rjust(2) + ' ='

lineitem = [plus, minus, multi, div]
line = (18 * ' ').join(lineitem)
print line
fobj.writelines(line + '
')
def base_exeicise(): for col in range(10): base_exei_oneline(1, 20, 1, 50, 1, 9, 1, 9)

def type1_str(summin=1, summax=100): ''' summin,summax:允许总和的最小最大值 ''' sym1 = sym[randint(0, 1)] sym2 = sym[randint(0, 1)]

if sym1 == ' + ' and sym2 == ' + ':
    sum_ = randint(summin + 2, summax)
    first = randint(summin, sum_ - 2)
    second = sum_ - first
    second = randint(summin, second - 1)
    third = sum_ - first - second
elif sym1 == ' + ' and sym2 == ' - ':
    sum_ = randint(summin + 1, summax)
    first = randint(summin, sum_ - 1)
    second = sum_ - first
    third = randint(summin, sum_)
elif sym1 == ' - ' and sym2 == ' + ':
    first = randint(summin + 1, summax)
    second = randint(summin, first)
    third = randint(first - second, summax)
elif sym1 == ' - ' and sym2 == ' - ':
    first = randint(summin + 2, summax)
    second = randint(summin, first)
    third = first - second
    third = randint(summin, third)

arithmetic = str(first).rjust(2) + sym1 + str(second).rjust(2) + sym2 + str(third).rjust(2)
print arithmetic
return arithmetic
def type2_str(multimin=1, multimax=9, summin=1, summax=100): ''' multimin,multimax:乘数、被乘数最小最大值 summin,summax:允许总和的最小最大值 ''' sym1 = sym[randint(0, 1)] second = randint(multimin, multimax) third = randint(multimin, multimax) multi = second * third

if sym1 == ' + ':
    first = randint(summin, summax - multi)
else:
    first = randint(multi, summax)

arithmetic = str(first).rjust(2) + sym1 + str(second).rjust(2) + ' x ' + str(third).rjust(2)
print arithmetic
return arithmetic
def type3_str(multimin=1, multimax=9, summin=1, summax=100): ''' multimin,multimax:乘数、被乘数最小最大值 summin,summax:允许总和的最小最大值 ''' sym1 = sym[randint(0, 1)] second = randint(multimin, multimax) third = randint(multimin, multimax) multi = second * third

if sym1 == ' + ':
    first = randint(summin, multi)
    second = multi - first
else:
    second = randint(summin, summax - multi)
    first = multi + second

arithmetic = '(' + str(first).rjust(2) + sym1 + str(second).rjust(2) + ')' + ' / ' + str(third).rjust(2)
print arithmetic
return arithmetic
def oneday_homework():

base_exeicise()

plus1 = type1_str()
plus2 = type1_str()

plus3 = type2_str()

plus4 = type3_str()
plus5 = type3_str()


line = [plus1, plus2, plus3]
lines = (29 * ' ').join(line)
print lines
fobj.writelines(lines + '
' * 4)


line = [plus4, plus5]
lines = (20 * ' ').join(line)
print lines
fobj.writelines(lines + '
' * 4)
print fobj.writelines(r'用时______分钟  对______题（共45题）')
oneday_homework() fobj.writelines('
' * 6) 
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