无法格式化字符串-Python

我无法格式化这个字符串，为什么会这样

def poem_description(publishing_date, author, title, original_work):
  poem_desc = "The poem {title} by {author} was originally published in {original_work} in {publishing_date}.".format(publishing_date, author, title, original_work)
  return poem_desc

my_beard_description = poem_description("1897", "Tauqeer", "Venice", "1992")

print(my_beard_description)

---

它应该是这样的：

poem_desc = "The poem {} by {} was originally published in {} `in {}.".format(publishing_date, author, title, original_work)`

或者像这样：

poem_desc = f"The poem {title} by {author} was originally published in {original_work} in {publishing_date}."

---

花括号应为空

{}

。在花括号之间键入了变量。只要去掉它们，你就可以走了

def poem_description(publishing_date, author, title, original_work):
  poem_desc = "The poem {} by {} was originally published in {} in {}.".format(title, author, original_work, publishing_date)
  return poem_desc

my_beard_description = poem_description("1897", "Tauqeer", "Venice", "1992")

print(my_beard_description)

---

此外，您还可以使用格式化字符串

poem_desc=f“{author}的诗{title}最初是在{publishing_date}的{original_work}中发表的。”

字符串的前缀是

f

，然后在字符串内部的花括号之间添加变量。

如果要保持花括号语法，必须使用

.format\u map

而不是

.format

或使用字典解包。目前，它需要一个包含键

title

、

author

和所有其他键的词典都不存在

def poem_description(publishing_date, author, title, original_work):
    poem_desc = "The poem {title} by {author} was originally published in {original_work} in {publishing_date}.".format(publishing_date=publishing_date, author=author, title=title, original_work=original_work)
    return poem_desc


my_beard_description = poem_description("1897", "Tauqeer", "Venice", "1992")

# Print the result
print(my_beard_description)

my_dict = {"title" : title, "author" : author} 
poem_desc = "The poem {title} by {author}".format_map(my_dict)
# or simply
poem_desc = "The poem {title} by {author}".format_map(**my_dict)

---

你能说清楚吗？错误是什么？预期的输出是什么？您所说的“您无法”是什么意思？以下消息显示“回溯（最近一次调用）：文件“C:/Users/Tauqeer Shoaib/PycharmProjects/HelloWorld/main.py”，第5行，在my_beard_description=poem_description（“1897”，“Tauqeer”，“Venice”，“1992”）文件中”C:/Users/Tauqeer Shoaib/PycharmProjects/HelloWorld/main.py”，第2行，在poem_description poem_desc=“The poem{title}by{author}最初是在{publishing_date}的{original_work}中发表的

format

是passé。当然这个替代方法可以工作，但它不能回答为什么会这样的问题。当我在参数和字符串中添加关键字时，它可以工作fine@t92嗯，当使用字符串格式时，不应该在其中添加参数。当使用f字符串时，它需要参数。不过String.format是基于参数顺序的。我不应该在其中添加参数？@t92使用String格式时不应该在其中添加参数。使用f-string时需要参数。因此，只有在参数和字符串中添加关键字时，我才应该在花括号中添加变量？如果使用格式化字符串，字符串前缀为

f

，则只应该在花括号中添加变量

string=f“a-{a}的值”

@t92只需使用f-string，例如

f'thepoem{title}…'

。删除

.format

（Python 3.6+）。