3.10 PAT1024 乙级 python（第四个测试点错误等后期修改）

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x = list(input())
result = ''
eindex = 0
daxiao = 0
pindex = 0
nindex = 0
endnindex = 0
for i in range(len(x)):
if x[i].isdigit() and eindex == 0 :
nindex = i
elif x[i] =='.':
pindex = i
elif x[i] == 'E':
eindex = i
elif x[i].isdigit() and eindex != 0 and endnindex == 0:
endnindex = i
elif (x[i] == '+' or x[i] == '-') and eindex != 0:
if x[i] == '+':
daxiao = 1
zhishu = int(''.join(x[endnindex:len(x)]))
if x[0] == '-':
result = result + '-'
if zhishu ==0:
result += ''.join(x[1:nindex+1])
else:
if daxiao == 1:
if nindex-2>int(x[-2:-1][0]+x[-1]):
result = result+x[1]+ ''.join(x[3:zhishu+3])+'.'+''.join(x[zhishu+1:nindex+1])
else:
result = result+x[1]+''.join(x[3:nindex+1])+'0'*(zhishu-(nindex-2))
else:
result = result+'0.'+(zhishu-1)*'0'+x[1]+''.join(x[3:nindex+1])
print(result)