我正在尝试编写一个程序，在其中输入名称和姓氏，然后代码检查名称是否无效（下面的无效列表）。如果有任何无效，它会要求我再次说出名字，并向我显示所有无效的列表。 失效列表（我还将显示代码版本）： -名称有数字 -名称带有符号 -名称中没有空格 -它有一个以上的空间 -名称之一太短或太长 -名称的第一个字母是空格 -名字的最后一个字母是空格
在这里我不能使用异常，因为这些不是代码错误。我已经用Ifs做到了，但是到了一定程度，只有很多Ifs才可行。
def has_digits(name):
digits = any(c.isdigit() for c in name)
if digits == True:
return True
print("Your name has digits.")
else:
return False
def has_symbols(name):
symbols = any(not c.isalnum() and not c.isspace() for c in name)
if symbols == True:
return True
print("Your name has symbols.")
else:
return False
def has_no_spaces(name):
spaces = any(c.isspace() for c in name)
if not spaces == True:
return True
print("You only gave me a name.")
else:
return False
def many_spaces(name):
m_s = name.count(' ') > 1
if m_s == True:
return True
print("Your name has more than one space.")
else:
return False
def unrealistic_length(name, surname):
length= (float(len(name)) < 3 or float(len(name)) > 12) or float(len(surname)) < 5 or float(len(surname) > 15)
if length == True:
return True
print("Your name has an unrealistic size.")
else:
return False
def first_space(name):
f_s = name[0] == " "
if f_s == True:
return True
print("The first letter of your name is a space.")
else:
return False
def last_space(name):
l_s = name[-1] == " "
if l_s == True:
return True
print("The last letter of your name is a space.")
else:
return False
name = "bruh browski"
namesplit = name.split(" ")
name1 = namesplit[0]
name2 = namesplit[1]
print(has_digits(name))
print(has_symbols(name))
print(has_no_spaces(name))
print(many_spaces(name))
print(unrealistic_length(name1, name2))
print(first_space(name))
print(last_space(name))
也许这些照片不应该放在自定义文件中。我不知道。我几乎可以确定要执行for循环是要走的路，但是我无法想象如何做到。
结果：
False
False
False
False
False
False
False
答案 0 :(得分：3)
除非您可以用执行相同操作的其他方法替换它们，否则用于定义每次“无效”计数的方法将必须保留。但是您可以使用生成器表达式一次检查所有这些条件：
if any(is_invalid(name) for is_invalid in [
has_digits, has_symbols, has_no_spaces, many_spaces, unrealistic_length, first_name, last_name
]):
# then this string is invalid
# otherwise, all of those returned false, meaning the string is valid.
然后您可以使用该条件来确定何时停止询问用户，或者是否需要停止询问。
如果您不想单独定义所有这些功能，则也可以使用lambda来执行相同的操作。
作为旁注，在实际将其用于生产中以检查名称的有效性之前，我建议您先看看Falsehoods Programmers Believe about Names的列表。即使与您的用例无关，这也是一个有趣的阅读。
答案 1 :(得分：1)
您可以使用一个函数来调用所有其他函数并适当地处理它。
def master_verify(name):
# Put all your verify functions in the list below.
verify_funcs = [has_digits, has_symbols, has_no_spaces, many_spaces,
unrealistic_length, first_space, last_space]
# It will return True if any your functions return True. In this case,
# returning True means the name is invalid (matching your other
# function design). Returning False means the name is valid.
return any(is_invalid(name) for is_invalid in verify_funcs)
由于您提到过要让程序查找任何名称错误并要求用户重试，因此我们可以编写一个循环来处理此问题。
def get_name():
while True:
# Loop until you get a good name
name = input("Enter your name: ").strip()
if master_verify(name):
# Remember, if True this means invalid
print("Invalid name. Try again.")
continue # continue jumps to the top of a loop, skipping everything else.
return name # Will only get here if the name is valid.
我还建议您在unrealistic_length函数中进行名称和姓氏的区分。
然后，您要做的就是
name = get_name()
# All of the validation has already happened.
print(f"The correct and validated name is: {name}")
最后但并非最不重要的一点是，return之后的函数中的任何内容均不可访问。因此，您的许多print都不会发生。将print语句放在返回之前。
答案 2 :(得分：0)
好的。我已经设法自己做到了。我仍然认为有更好的方法可以做到这一点，但这就是我找到的方法。
errors_list = []
print("Hi. Tell me your first and last name.")
def choose_name(name):
global fname
global sname
fname = ""
sname = ""
global errors_list
try:
no_letters = any(c.isalpha() for c in name)
no_spaces = name.count(" ") == 0
digits = any(c.isdigit() for c in name)
symbols = any(not c.isalnum() and not c.isspace() for c in name)
many_spaces = name.count(" ") > 1
first_space = name[0] == " "
last_space = name[-1] == " "
if no_letters == False:
errors_list.append("It has no letters")
if no_spaces == True:
errors_list.append("It has no spaces")
else:
namesplit = name.split(" ")
fname = namesplit[0]
sname = namesplit[1]
pass
if fname and sname is not "":
bad_length = (float(len(fname)) < 3 or float(len(fname)) > 12) or float(len(sname)) < 4 or float(len(sname) > 15)
if bad_length == True:
errors_list.append("One of your names has an unrealistic size")
pass
else:
bad_length = (float(len(name)) < 3 or float(len(name)) > 12)
if bad_length == True:
errors_list.append("It has an unrealistic size")
pass
if digits == True:
errors_list.append("It has digits")
pass
if symbols == True:
errors_list.append("It has symbols")
pass
if many_spaces == True:
errors_list.append("It has more than one space")
pass
if first_space == True:
errors_list.append("The first letter is a space")
pass
if last_space == True:
errors_list.append("The last letter is a space")
pass
except IndexError:
print("You must write something. Try again.")
name = input("My name is ").title()
choose_name(name)
name = input("My name is ").title()
choose_name(name)
while True:
if len(errors_list) != 0:
print("Your name has these errors:")
for i in errors_list:
print(" " + str(errors_list.index(i) + 1) + "- " + i + ".")
print("Try again.")
errors_list.clear()
name = input("My name is ").title()
choose_name(name)
else:
print("Nice to meet you, " + fname + " " + sname + ".")
break
输入名称'----...'
时的结果Hi. Tell me your first and last name.
My name is ----...
Your name has these errors:
1- It has no letters.
2- It has symbols.
3- It has more than one space.
4- The last letter is a space.
Try again.
My name is