since there isn't any useful How-To for beginners of PyQt5,   I'm stuck with a little problem       。  @pyqtSlot() def on_pushButton_17_clicked(self):      """     Slot documentation goes here.     """     A=self.lineEdit_22.text()     B=self.lineEdit_23.text()     print(A + B)   Show 12 instead of 3（1+2=3）  I want to enter the number in the lineEdit inside the calculation by PushButton, and get the value.
In Python, how can I parse a numeric string like "545.2222" to its corresponding float value, 545.2222? Or parse the string "31" to an integer, 31?  I just want to know how to parse a float str to a float, and (separately) an int str to an int.
New messages flagged blue bubble does not go away When does $\,n\mid q^3 \Rightarrow n\mid q\,$? I think this is true because of prime factorisations, i.e.  If $3$ a factor of the prime factorisation of $q^3$, then $3$ is a factor of the prime factorisation of $q$.  Therefore If $3$ divides $q^3$, then $3$ divides $q$.  Or for a general case, if $n$ divides $q^3$; then $n$ divides $q$. Is this correct? I've placed a command block making it day all the time. I want to turn it off, but I've lost it. What's the quickest way to find it? php - Should I encrypt email addresses? Format string dynamically What does the text inside parentheses in @interface and @implementation directives mean? Assuming i have a line that i want to add to a file without opening an editor.  How could i append this line  alias list='ls -cl --group-directories-first'   to this file  config.fish Intermediate fields between $\mathbb{Z}_2 (\sqrt{x},\sqrt{y})$ and $\mathbb{Z}_2 (x,y)$ Polynomial degree 3 Equation What was the galaxy formation Rust saw before confronting Erol Childress? What was the galaxy formation Rust saw before confronting Erol Childress in  S01E08?  It was weird like out of the series. I guess it was some sort of hallucination, a product of Rust's madness or addiction. In how many ways can $7$ girls and $3$ boys sit on a bench in such a way that every boy sits next to at least one girl In how many ways can $7$ girls and $3$ boys sit on a bench in such a way that every boy sits next to at least one girl  The answer is supposedly $1,693,440 + 423,360 = 2,116,800$ How do I write a mathematical equation for ARIMA (2,1,0) x (0,2,2) period 12 I would appreciate if someone could help me write the mathematical equation for the seasonal ARIMA (2,1,0) x (0,2,2) period 12. I'm a little confused with how to go about this. I would prefer an equation involving $Y_t , e_t, θ$ and $Θ$. How to show that $\lim\limits_{x \to \infty} f'(x) = 0$ implies $\lim\limits_{x \to \infty} \frac{f(x)}{x} = 0$? An interesting exercise about converging positive series, involving $\sum_{n\geq 1}a_n^{\frac{n-1}{n}}$ I remember that the main character is trying to find the group that destroyed his home planet while he was on a mission. His planet was very difficult to live on and the people became expert in martial arts and were the best soldiers in the galaxy. They were mercenaries and often helped against tyrants. There was a very memorable section in at least one book about an initiation task that the main character had to do in that he had to survive in their wilderness for days. He was at some point surrounded in a old building by thousands of poisonous worm/snake creatures that he managed to survive until rescued by the leaders. We can solve the equation $x^x=c$ using the Lambert $W$ function, but how do we solve $x^{x^x}=c$ , Independence of disjoint events Ignoring somebody screws up the avatar list When I ignore a user, the avatar list looks weird.    The blank line beneath the row with the avatar of the ignoree is quite annoying.    I use Google Chrome on OS X.  There was a  tagged  but it still looks weird. Currently my bibliography says "Literatur" (german). But I want something completely different there. How can I achieve that? Are \( and \) preferable to dollar signs for math mode? Along the lines of , what reasons are there (if any) to favor \( ... \) over $ ... $?