Python - 字符串练习

mystr = "All animals are equal. Some are more equal"
vowels = "aeiou"
count=0
for x in mystr:
	 	if x.lower() in vowels: count+=1
print ("Number of Vowels:", count)

mystr = '10101'

def strtoint(mystr):
	 	for x in mystr:
	 	 	 if x not in '01': return "Error. String with non-binary characters"
	 	num = int(mystr, 2)
	 	return num
print ("binary:{} integer: {}".format(mystr,strtoint(mystr)))

digits = [str(x) for x in range(10)]
mystr = 'He12llo, Py00th55on!'
chars = []
for x in mystr:
	 	if x not in digits:
	 	 	 chars.append(x)
newstr = ''.join(chars)
print (newstr)