Apart from the base R way: length(a) == 0 there is rlang::is_empty. However, replacing the return value of a function that usually returns a list with something else in some cases does not sound like a good idea and will make the function much harder to use without introducing edge-...
I am trying to use boolean indexing on a Pandas Series in order to determine if there are values in my Series that are not strings. My approach so far is: contains_non_string = s[type(s) != str].any() When I run this, I get the following error: TypeError: '...
how could I, by using cheaper tools or techniques, determine what kind of atoms, molecules/chemical compounds, determine which exact atoms make up the things visible light enables me to see around me? I would like to look at something and go beyond just "It's plastic-like", but actually ...
There are, however, many types of errors and die varieties that can increase the value of your silver dollars and it would behoove you to research these and learn how to spot them on your coins. Bottom Line: You should do research about a coin in order to determine if it is an error...
The Silver & Silver team is committed to helping disabled adults and children. In Mr. Silver's own words, "It is my genuine hope that this information will help you learn the important things that you shoul...
根据最后一段中的For adults,choice is good,but too many choices can be a problem,so the lab will try to determine if that is also true for babies.(对于成年人来说,选择是好的,但选择太多可能是一个问题,因此实验室将尝试确定婴儿是否也是如此)可知,接下来实验室研究重点是"...
Every silver lining has the Volt, midst, and know what you want is, how to pay the price, what purposes. 翻译结果3复制译文编辑译文朗读译文返回顶部 Every silver lining has the Volt, midst, and know what you want is, how to pay the price, what purposes. ...
How to determine whether 1099-MISC income is from self-employment? Ask Question Asked 7 years, 6 months ago Modified 7 years, 6 months ago Viewed 4k times 6 I have income that was reported on Form 1099-MISC, Box 7 (nonemployee compensation). I understand that if it is self-employm...
the U.S. government decided to stop using silver in its coins after 1964.5Any American dimes, quarters, half dollars, or dollar coins with a date of 1964 or earlier contain 90% silver. If the price of silver is $20 per ounce, these silver coins are worth approximately 14 times theirface...
Another significant milestone occurred in 1862, when the government issuedfiat moneywith no convertibility to silver, gold, or any other metal. Although fiat money is the norm in today's monetary system, this was a radical move at the time, and it was met with vocal opposition. In 1879, ...