python中单位转换_Python入门练习 - 简单的计量单位转换

练习1: 货币转换

tempStr = input('Please input an amount stating with RMB or USD: ').strip()

tempSign = tempStr[0:3].upper()

tempNum = tempStr[3:]

def isfloat(value):

try:

float(value)

return True

except:

return False

rate = 6.78

if isfloat(tempNum):

tempNum = float(tempNum)

if tempSign == "RMB":

result = tempNum / rate

print('USD{0:.2f}'.format(result))

elif tempSign == 'USD':

result = tempNum * rate

print('RMB{0:.2f}'.format(result))

else:

print('input invalid.')

else:

print('Are you kidding?')

练习2：温度转换

tempStr = input('Input a temperature starting with C or F').strip()

tempSign = tempStr[0].upper()

tempNum = tempStr[1:]

def isfloat(value):

try:

float(value)

return True

except:

return False

if isfloat(tempNum):

tempNum = float(tempNum)

if tempSign == "F":

result = (tempNum - 32) / 1.8

print('C{0:.2f}'.format(result))

elif tempSign == 'C':

result = tempNum * 1.8 + 32

print('F{0:.2f}'.format(result))

else:

print('Temperature sign is missing or invalid.')

else:

print('Are you kidding?')