如何在 Python 的同一行上打印变量和字符串？
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【中文标题】如何在 Python 的同一行上打印变量和字符串？【英文标题】：How can I print variable and string on same line in Python? 【发布时间】：2013-06-13 18:38:01 【问题描述】：我正在使用 python 计算如果每 7 秒有一个孩子出生，那么 5 年内将出生多少个孩子。问题出在我的最后一行。当我在它的任一侧打印文本时，如何让变量工作？
这是我的代码：
currentPop = 312032486
oneYear = 365
hours = 24
minutes = 60
seconds = 60
# seconds in a single day
secondsInDay = hours * minutes * seconds
# seconds in a year
secondsInYear = secondsInDay * oneYear
fiveYears = secondsInYear * 5
#Seconds in 5 years
print fiveYears
# fiveYears in seconds, divided by 7 seconds
births = fiveYears // 7
print "If there was a birth every 7 seconds, there would be: " births "births"
【问题讨论】：
2020 年要小心（常识，我知道 :D）。打印在 Python3 中已经成为一个函数，现在需要用括号来使用：print(something)（另外 Python2 从今年开始就已经过时了。）
【参考方案1】：
还有两个
第一个
>>> births = str(5)
>>> print("there are " + births + " births.")
there are 5 births.
添加字符串时，它们会连接起来。
第二个
字符串的format（Python 2.6 和更新版本）方法也可能是标准方法：
>>> births = str(5)
>>>
>>> print("there are births.".format(births))
there are 5 births.
format 方法也可以与列表一起使用
>>> format_list = ['five', 'three']
>>> # * unpacks the list:
>>> print("there are births and deaths".format(*format_list))
there are five births and three deaths
或字典
>>> format_dictionary = 'births': 'five', 'deaths': 'three'
>>> # ** unpacks the dictionary
>>> print("there are births births, and deaths deaths".format(**format_dictionary))
there are five births, and three deaths
【讨论】：
【参考方案2】：Python 是一种用途广泛的语言。您可以通过不同的方法打印变量。我在下面列出了五种方法。您可以根据自己的方便使用它们。
示例：
a = 1
b = 'ball'
方法一：
print('I have %d %s' % (a, b))
方法二：
print('I have', a, b)
方法三：
print('I have '.format(a, b))
方法四：
print('I have ' + str(a) + ' ' + b)
方法五：
print(f'I have a b')
输出将是：
I have 1 ball
【讨论】：
决定和你的编程风格有关：M2是过程式编程，M3是面向对象编程。 M5 的关键字是formatted string literal。如果需要，应该使用像 M1 和 M4 这样的字符串操作，这里不是这种情况（M1 用于字典和元组；M4 例如用于 ascii-art 和其他格式化输出）【参考方案3】：打印时使用,分隔字符串和变量：
print("If there was a birth every 7 seconds, there would be: ", births, "births")
打印函数中的,用一个空格分隔项目：
>>> print("foo", "bar", "spam")
foo bar spam
或者更好地使用string formatting:
print("If there was a birth every 7 seconds, there would be: births".format(births))
字符串格式化功能更强大，还允许您执行一些其他操作，例如填充、填充、对齐、宽度、设置精度等。
>>> print(":d :03d :>20f".format(1, 2, 1.1))
1 002 1.100000
^^^
0's padded to 2
演示：
>>> births = 4
>>> print("If there was a birth every 7 seconds, there would be: ", births, "births")
If there was a birth every 7 seconds, there would be: 4 births
# formatting
>>> print("If there was a birth every 7 seconds, there would be: births".format(births))
If there was a birth every 7 seconds, there would be: 4 births
【讨论】：
【参考方案4】：您可以使用 f-string 或 .format() 方法
使用 f-string
print(f'If there was a birth every 7 seconds, there would be: births births')
使用 .format()
print("If there was a birth every 7 seconds, there would be: births births".format(births=births))
【讨论】：
【参考方案5】：如果你在字符串和变量之间使用逗号，像这样：
print "If there was a birth every 7 seconds, there would be: ", births, "births"
【讨论】：
【参考方案6】：只需在中间使用 ,（逗号）。
请参阅此代码以更好地理解：
# Weight converter pounds to kg
weight_lbs = input("Enter your weight in pounds: ")
weight_kg = 0.45 * int(weight_lbs)
print("You are ", weight_kg, " kg")
【讨论】：
【参考方案7】：Python 3
最好使用格式选项
user_name=input("Enter your name : )
points = 10
print ("Hello, your point is : ".format(user_name,points)
或将输入声明为字符串并使用
user_name=str(input("Enter your name : ))
points = 10
print("Hello, "+user_name+" your point is " +str(points))
【讨论】：
String"Enter your name : 缺少右引号
print ("Hello, your point is : ".format(user_name,points) 缺少右括号。【参考方案8】：
如果您使用的是 python 3.6 或最新版本， f-string 是最好的和最简单的
print(f"your_varaible_name")
【讨论】：
【参考方案9】：略有不同：使用 Python 3 并在同一行中打印 几个 变量：
print("~~Create new DB:",argv[5],"; with user:",argv[3],"; and Password:",argv[4]," ~~")
【讨论】：
【参考方案10】：从 python 3.6 开始，您可以使用 Literal String Interpolation.
births = 5.25487
>>> print(f'If there was a birth every 7 seconds, there would be: births:.2f births')
If there was a birth every 7 seconds, there would be: 5.25 births
【讨论】：
【参考方案11】：使用String formatting
print("If there was a birth every 7 seconds, there would be: births".format(births))
# Will replace "" with births
如果你做一个玩具项目使用：
print('If there was a birth every 7 seconds, there would be:' births'births)
或
print('If there was a birth every 7 seconds, there would be: %d births' %(births))
# Will replace %d with births
【讨论】：
【参考方案12】：在当前的 python 版本中，您必须使用括号，如下所示：
print ("If there was a birth every 7 seconds", X)
【讨论】：
【参考方案13】：您将首先创建一个变量：例如：D = 1。然后执行此操作，但将字符串替换为您想要的任何内容：
D = 1
print("Here is a number!:",D)
【讨论】：
【参考方案14】：如果你想使用 python 3，这很简单：
print("If there was a birth every 7 second, there would be %d births." % (births))
【讨论】：
【参考方案15】：我将您的脚本复制并粘贴到 .py 文件中。我使用 Python 2.7.10 按原样运行它并收到相同的语法错误。我还尝试了 Python 3.5 中的脚本并收到以下输出：
File "print_strings_on_same_line.py", line 16
print fiveYears
^
SyntaxError: Missing parentheses in call to 'print'
然后，我修改了打印出生人数的最后一行，如下所示：
currentPop = 312032486
oneYear = 365
hours = 24
minutes = 60
seconds = 60
# seconds in a single day
secondsInDay = hours * minutes * seconds
# seconds in a year
secondsInYear = secondsInDay * oneYear
fiveYears = secondsInYear * 5
#Seconds in 5 years
print fiveYears
# fiveYears in seconds, divided by 7 seconds
births = fiveYears // 7
print "If there was a birth every 7 seconds, there would be: " + str(births) + " births"
输出是（Python 2.7.10）：
157680000
If there was a birth every 7 seconds, there would be: 22525714 births
我希望这会有所帮助。
【讨论】：
【参考方案16】：您可以使用格式字符串：
print "There are %d births" % (births,)
或者在这个简单的例子中：
print "There are ", births, "births"
【讨论】：
如果使用第二种方式要小心，因为那是一个元组，而不是一个字符串。【参考方案17】：您可以使用string formatting 来执行此操作：
print "If there was a birth every 7 seconds, there would be: %d births" % births
或者你可以给print多个参数，它会自动用空格分隔它们：
print "If there was a birth every 7 seconds, there would be:", births, "births"
【讨论】：
感谢 Amber 的回答。你能解释一下 % 符号后面的 'd' 做什么吗？谢谢%d 表示“将值格式化为整数”。同样，%s 是“将值格式化为字符串”，%f 是“将值格式化为浮点数”。我在答案中链接到的 Python 手册部分记录了这些以及更多内容。以上是关于如何在 Python 的同一行上打印变量和字符串？的主要内容，如果未能解决你的问题，请参考以下文章
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