python-统计句子中有多少数字方法

def print_numcount_03():
    result = 0
    content = raw_input('eter number and string:\n')
    for i in content:
        if i in "1234567890":
            result += 1
    print result
print_numcount_03()
def print_numcount_02():
    result = 0
    index = 0
    content = raw_input('eter number and string:\n')
    while index <= len(content) -1:
        if content[index] in "1234567890":
            result += 1
        index += 1
    print result
#print_numcount_02()
def print_numcount_01():
    result = 0
    content = raw_input('eter number and string:\n')
    for i in content:
        if i.isdigit(): # isdigit() 方法检测字符串是否只由数字组成。
            result += 1
    print result
#print_numcount_01()