文章目录

• 1、示例程序
• 2、filter

1、示例程序

输出不以ST开头的字符串

array_txn=["ST12345","ST12346","SN12345","SN12346"]

#判断是否以ST开头
def func_st(txn):
    return txn.startswith("ST")

def filter_test(func,array):
    ret=[]
    for item in array:
        if not func(item):      
            ret.append(item)
    return ret

res=filter_test(func_st,array_txn)
print(res)

输出：
[‘SN12345’, ‘SN12346’]

2、filter

filter可实现上述程序的功能

array_txn=["ST12345","ST12346","SN12345","SN12346"]

res=filter(lambda x:x.startswith("ST"),array_txn)   #ST开头的字符串;返回值为可迭代对象，只能遍历一次
print(list(res))

输出：
[‘ST12345’, ‘ST12346’]

标签：txn,学海无涯,Python,res,ST,filter,func,array
来源： https://blog.csdn.net/chuhe163/article/details/90523433