如何在Python print语句中让逗号、句号紧邻变量消除多余空格

Python内置print()函数传递多个逗号分隔的参数时，默认会使用空格作为参数之间的分隔符（对应函数默认参数sep=' '），因此你代码里将标点作为单独参数传递时，就会在标点前后自动多出多余空格。

方法1：使用f-string格式化字符串（Python 3.6及以上版本推荐） #

这是目前可读性最高、写法最简洁的方案，直接将变量嵌入字符串模板中，标点位置可以手动完全控制：

# 两个逻辑完全一致的分支可以合并减少重复代码
if year < 2001 or year > 2100:
    print(f"{name}, you were born in {year}.")
else:
    print(f"{name}, you were born in {year}, which is the 21st century.")

print(f"{name}'s classification is {classification}.")

注：你原代码中year<2001和year>2100两个分支逻辑完全一致，已合并为同一个判断条件

方法2：使用str.format() 兼容旧版本Python #

如果需要兼容Python3.5及更早版本，可以用format方法实现同样的格式化效果：

if year < 2001 or year > 2100:
    print("{}, you were born in {}.".format(name, year))
else:
    print("{}, you were born in {}, which is the 21st century.".format(name, year))

print("{}'s classification is {}.".format(name, classification))

方法3：修改print函数的sep参数 #

如果你不想调整字符串拼接逻辑，可以直接把分隔符参数sep设置为空字符串，手动在需要空格的位置补空格：

if year < 2001 or year > 2100:
    print(name, ", you were born in ", year, ".", sep='')
else:
    print(name, ", you were born in ", year, ", which is the 21st century.", sep='')

print(name, "'s classification is ", classification, ".", sep='')

内容的提问来源于stack exchange，提问作者amanda