assign

问题 My issue is that if I reassign an item in a list such that the reassignment happens during a parallel process, then after the parallel processes are finished, the change reverts back to its original state. In the below example- greatly simplified for ease of understanding-, I have a function that changes the list element NoZeros[0] to "chicken" and a second function that changes NoZeros[1] to "sandwich". I even put "global" in the second function just to demonstrate that this isn't a local vs

来源： https://stackoverflow.com/questions/19735395/stl-assignment-operator-vs-assign-member-function

来源： https://stackoverflow.com/questions/27812789/does-python-copy-objects-on-assignment

来源： https://stackoverflow.com/questions/27812789/does-python-copy-objects-on-assignment

问题 In R there is a function called assign which assigns a value to a name in the environment. EG: assign("Hello", 2) > Hello [1] 2 In python I can't seem to do the same. I initially tried: import numpy as np import pandas as pd import os for file in os.listdir('C:\\Users\\Olivia\\Documents'): if file.endswith(".csv"): os.path.splitext(file)[0] = pd.read_csv('C:\\Users\\Olivia\\Documents\\' + file) But I can see this is trying to make a string equal to a file which doesn't work. I managed to get

问题 In R there is a function called assign which assigns a value to a name in the environment. EG: assign("Hello", 2) > Hello [1] 2 In python I can't seem to do the same. I initially tried: import numpy as np import pandas as pd import os for file in os.listdir('C:\\Users\\Olivia\\Documents'): if file.endswith(".csv"): os.path.splitext(file)[0] = pd.read_csv('C:\\Users\\Olivia\\Documents\\' + file) But I can see this is trying to make a string equal to a file which doesn't work. I managed to get

问题 this is very simple, but I have searched and failed to find a solution for this small problem. I want to use the argument of a function as the name for a new data frame, for example: assign.dataset<-function(dataname){ x<-c(1,2,3) y<-c(3,4,5) dataname<<-rbind(x,y) } Then assign.dataset(new.dataframe.name) just creates a new dataset with the name dataname . I have tried to use the paste and assign functions but with no success. Many thanks 回答1: You can do it like this... assign.dataset<

问题 I have an object in PHP, of the type MyObject . $myObject instanceof MyObject Now, in the class MyObject , there is a non-static function, and in there, I use the reference to "me", like $this , but I also have another object there. Is it possible, without doing $this = $myObject , to achieve more or less the same effect, like something of the sort set_object_vars($this, get_object_vars($myObject)) ? 回答1: <?php class MyObject { public function import(MyObject $object) { foreach (get_object

问题 I have an object in PHP, of the type MyObject . $myObject instanceof MyObject Now, in the class MyObject , there is a non-static function, and in there, I use the reference to "me", like $this , but I also have another object there. Is it possible, without doing $this = $myObject , to achieve more or less the same effect, like something of the sort set_object_vars($this, get_object_vars($myObject)) ? 回答1: <?php class MyObject { public function import(MyObject $object) { foreach (get_object

问题 I have an object in PHP, of the type MyObject . $myObject instanceof MyObject Now, in the class MyObject , there is a non-static function, and in there, I use the reference to "me", like $this , but I also have another object there. Is it possible, without doing $this = $myObject , to achieve more or less the same effect, like something of the sort set_object_vars($this, get_object_vars($myObject)) ? 回答1: <?php class MyObject { public function import(MyObject $object) { foreach (get_object