+： 'int'と 'unicode'のためのサポートされていないオペランドタイプ

Question

私は書いた式から変数を返すためにtemplatetagを使って作業しています。私はなぜこのトレースバックを取得しているのかを調べようとしています。シェルの数式をテストしたところ、すべて正常に動作しています。私はタグとビューでいくつかのprintステートメントを実行しました。しかし、これの理由を理解することはできません。

TRACEBACK：

Traceback: 
File "/Users/urbanrunic/.virtualenvs/levelend/lib/python2.6/site-packages/django/core/handlers/base.py" in get_response 
    117.        response = middleware_method(request, e) 
File "/Users/urbanrunic/.virtualenvs/levelend/lib/python2.6/site-packages/django/core/handlers/base.py" in get_response 
    111.       response = callback(request, *callback_args, **callback_kwargs) 
File "/Users/urbanrunic/developement/levelend/levelend/levelend/configs/common/../../apps/common/utils/decorators.py" in wrapper 
    65.       context_instance=RequestContext(request), mimetype=mimetype) 
File "/Users/urbanrunic/.virtualenvs/levelend/lib/python2.6/site-packages/django/shortcuts/__init__.py" in render_to_response 
    20.  return HttpResponse(loader.render_to_string(*args, **kwargs), **httpresponse_kwargs) 
File "/Users/urbanrunic/.virtualenvs/levelend/lib/python2.6/site-packages/django/template/loader.py" in render_to_string 
    188.   return t.render(context_instance) 
File "/Users/urbanrunic/.virtualenvs/levelend/lib/python2.6/site-packages/django/template/base.py" in render 
    123.    return self._render(context) 
File "/Users/urbanrunic/.virtualenvs/levelend/lib/python2.6/site-packages/django/template/base.py" in _render 
    117.   return self.nodelist.render(context) 
File "/Users/urbanrunic/.virtualenvs/levelend/lib/python2.6/site-packages/django/template/base.py" in render 
    744.     bits.append(self.render_node(node, context)) 
File "/Users/urbanrunic/.virtualenvs/levelend/lib/python2.6/site-packages/django/template/debug.py" in render_node 
    73.    result = node.render(context) 
File "/Users/urbanrunic/.virtualenvs/levelend/lib/python2.6/site-packages/django/template/loader_tags.py" in render 
    127.   return compiled_parent._render(context) 
File "/Users/urbanrunic/.virtualenvs/levelend/lib/python2.6/site-packages/django/template/base.py" in _render 
    117.   return self.nodelist.render(context) 
File "/Users/urbanrunic/.virtualenvs/levelend/lib/python2.6/site-packages/django/template/base.py" in render 
    744.     bits.append(self.render_node(node, context)) 
File "/Users/urbanrunic/.virtualenvs/levelend/lib/python2.6/site-packages/django/template/debug.py" in render_node 
    73.    result = node.render(context) 
File "/Users/urbanrunic/.virtualenvs/levelend/lib/python2.6/site-packages/django/template/loader_tags.py" in render 
    127.   return compiled_parent._render(context) 
File "/Users/urbanrunic/.virtualenvs/levelend/lib/python2.6/site-packages/django/template/base.py" in _render 
    117.   return self.nodelist.render(context) 
File "/Users/urbanrunic/.virtualenvs/levelend/lib/python2.6/site-packages/django/template/base.py" in render 
    744.     bits.append(self.render_node(node, context)) 
File "/Users/urbanrunic/.virtualenvs/levelend/lib/python2.6/site-packages/django/template/debug.py" in render_node 
    73.    result = node.render(context) 
File "/Users/urbanrunic/.virtualenvs/levelend/lib/python2.6/site-packages/django_static/templatetags/django_static.py" in render 
    108.   code = self.nodelist.render(context) 
File "/Users/urbanrunic/.virtualenvs/levelend/lib/python2.6/site-packages/django/template/base.py" in render 
    744.     bits.append(self.render_node(node, context)) 
File "/Users/urbanrunic/.virtualenvs/levelend/lib/python2.6/site-packages/django/template/debug.py" in render_node 
    73.    result = node.render(context) 
File "/Users/urbanrunic/.virtualenvs/levelend/lib/python2.6/site-packages/django/template/loader_tags.py" in render 
    64.    result = block.nodelist.render(context) 
File "/Users/urbanrunic/.virtualenvs/levelend/lib/python2.6/site-packages/django/template/base.py" in render 
    744.     bits.append(self.render_node(node, context)) 
File "/Users/urbanrunic/.virtualenvs/levelend/lib/python2.6/site-packages/django/template/debug.py" in render_node 
    73.    result = node.render(context) 
File "/Users/urbanrunic/.virtualenvs/levelend/lib/python2.6/site-packages/django/template/loader_tags.py" in render 
    64.    result = block.nodelist.render(context) 
File "/Users/urbanrunic/.virtualenvs/levelend/lib/python2.6/site-packages/django/template/base.py" in render 
    744.     bits.append(self.render_node(node, context)) 
File "/Users/urbanrunic/.virtualenvs/levelend/lib/python2.6/site-packages/django/template/debug.py" in render_node 
    73.    result = node.render(context) 
File "/Users/urbanrunic/.virtualenvs/levelend/lib/python2.6/site-packages/django/template/defaulttags.py" in render 
    311.    return self.nodelist_true.render(context) 
File "/Users/urbanrunic/.virtualenvs/levelend/lib/python2.6/site-packages/django/template/base.py" in render 
    744.     bits.append(self.render_node(node, context)) 
File "/Users/urbanrunic/.virtualenvs/levelend/lib/python2.6/site-packages/django/template/debug.py" in render_node 
    73.    result = node.render(context) 
File "/Users/urbanrunic/.virtualenvs/levelend/lib/python2.6/site-packages/django/template/defaulttags.py" in render 
    227.     nodelist.append(node.render(context)) 
File "/Users/urbanrunic/developement/levelend/levelend/levelend/configs/common/../../apps/lender/templatetags/lender_tags.py" in render 
    15.   context[self.min] = monthlyPayment(self.how_much, self.apr_min, self.max_repayment_length) 
File "/Users/urbanrunic/developement/levelend/levelend/levelend/configs/common/../../apps/lender/utils.py" in monthlyPayment 
    34.  M = P/((1 - 1/(1 + mi) ** n)/mi) 

Exception Type: TemplateSyntaxError at /results/ 
Exception Value: Caught TypeError while rendering: unsupported operand type(s) for +: 'int' and 'unicode' 

FORMULA：

def monthlyPayment(P, mi, n): 
    """ returns monthly payment """ 
    M = P/((1 - 1/(1 + mi) ** n)/mi) 
    return M 

TAG：

class MinMonthlyPaymentsNode(Node): 
    def __init__(self, how_much, apr_min, max_repayment_length, min): 
     self.how_much, self.apr_min, self.max_repayment_length, self.min = how_much, apr_min, max_repayment_length, min 

    def render(self, context): 
     context[self.min] = monthlyPayment(self.how_much, self.apr_min, self.max_repayment_length) 
     return '' 

def do_monthly_payment(parser, token): 
    """ 
    returns a monthly payment based on the formula with interst and amount of loan 

    Example usage: 
    {% min_monthly_payments how_much, apr_min, max_repayment_length as [min]%} 
    """ 
    args = token.contents.split() 
    if len(args) != 6: 
     raise TemplateSyntaxError, "min_monthly_payments tag takes exactly six arguments" 
    if args[4] != 'as': 
     raise TemplateSyntaxError, "fourth argument to the min_monthly_payments tag must be 'as'" 

    return MinMonthlyPaymentsNode(args[1], args[2], args[3], args[5]) 

register.tag('min_monthly_payments', do_monthly_payment) 

M ODELS：再び

class Lender(TitleAndSlugModel): 
    """ 
    A lender 
    """ 

    DISBURSED_TYPES = get_namedtuple_choices('DISBURSED_TYPES', (
     (0, 'DIRECT_TO_SCHOOL', 'Directly to School'), 
     (1, 'SENT_TO_YOU', 'Sent to You'), 
    )) 
    SUITABILITY_TYPES = get_namedtuple_choices('SUITABILITY_TYPES', (
     (0, 'UNDERGRADUATE', 'Undergraduate'), 
     (1, 'GRADUATE', 'Graduate'), 
     (2, 'LAW', 'Law'), 
     (3, 'MEDICAL', 'Medical'), 
     (4, 'PARENTS', 'Parents'), 
    )) 

    # Financial summary 
    apr_min = models.DecimalField(max_digits=5, decimal_places=2) 
    apr_max = models.DecimalField(max_digits=5, decimal_places=2) 

    # Borrower rewards 
    auto_debit_discount = models.DecimalField(max_digits=5, decimal_places=2) 
    auto_debit_discount_note = models.CharField(max_length=250, null=True, blank=True) 
    additional_rewards_1 = models.DecimalField(max_digits=5, decimal_places=2, null=True, blank=True) 
    additional_rewards_1_note = models.CharField(max_length=250, null=True, blank=True) 
    additional_rewards_2 = models.DecimalField(max_digits=5, decimal_places=2, null=True, blank=True) 
    additional_rewards_2_note = models.CharField(max_length=250, null=True, blank=True) 

    # General info 
    loan_name = models.CharField(max_length=250) 
    loan_services_by = models.CharField(max_length=250) 
    funds_disbursed = models.PositiveIntegerField(choices=DISBURSED_TYPES.get_choices(), default=0) 
    co_signer_release_available = models.IntegerField(null=True, blank=True, help_text="Please enter in months") 
    suitable_for = MultiSelectField(max_length=50, choices=SUITABILITY_TYPES.get_choices()) 
    external_url = models.URLField(max_length=250) 
    lender_logo = FileBrowseField("Image", max_length=200, directory="uploads/", extensions=[".jpg"], blank=True, null=True) 
    schools = models.ManyToManyField(School) 

    # Repayment 
    max_repayment_length = models.IntegerField(null=True, blank=True, help_text="Please enter in years") 
    max_deferral_length = models.IntegerField(null=True, blank=True, help_text="Enter as X months after graduation") 

    # Rates 
    interest_rate_index = models.DecimalField(max_digits=5, decimal_places=2) 
    interest_rate_index_note = models.CharField(max_length=250, null=True, blank=True) 
    min_repayment_rate = models.DecimalField(max_digits=5, decimal_places=2) 
    min_repayment_rate_note = models.CharField(max_length=250, null=True, blank=True) 
    max_repayment_rate = models.DecimalField(max_digits=5, decimal_places=2) 
    max_repayment_rate_note = models.CharField(max_length=250, null=True, blank=True) 

    # Fees 
    origination_fee = models.DecimalField(max_digits=5, decimal_places=2, null=True, blank=True) 
    guarantee_fee = models.DecimalField(max_digits=5, decimal_places=2, null=True, blank=True) 

    # Notes 
    notes = models.TextField(null=True, blank=True) 

    def get_absolute_url(self): 
     return reverse("results_detail", args=[self.slug]) 

    def __unicode__(self): 
     return "%s" % (self.title) 

任意のヘルプは大幅にそれは正しい方向へのポイントだ場合でも、理解されるであろう。ありがとうございました！

Answer 1

と上記の行を置き換えます（整数または浮動小数点）。 Djangoには言えませんが、token.contents.split（）は変換しなければならない文字列のリストを返しています。 monthlyPayment関数でいくつかのデバッグプリントを自分で追加してチェックすることができます。

Answer 2

とします。argsは文字列の配列ですが、通常は数値を必要とする関数に文字列値を渡しています。

これは、Pythonが自動的にそれらを変換しないため、それらの関数で数式を実行しようとしていますが、機能しません。これらすべての引数が浮動小数点数ことになっている場合は、私はトレースバックがあなたの式で「MI」パラメータは、Unicode文字列ではなく、番号であることを示唆している

return MinMonthlyPaymentsNode(float(args[1]), float(args[2]), float(args[3]), float(args[5]))