logo
Tags down

shadow

Python print function does not return the updated variable


By : Nicki
Date : October 17 2020, 08:10 AM
like below fixes the issue Everything on the right-hand side is evaluated first. You can use the python byte-code dissasembler to see what is happening:
code :
>>> import dis
>>> dis.dis('x, y = x + 2, print(x)')
  1           0 LOAD_NAME                0 (x)
              2 LOAD_CONST               0 (2)
              4 BINARY_ADD
              6 LOAD_NAME                1 (print)
              8 LOAD_NAME                0 (x)
             10 CALL_FUNCTION            1
             12 ROT_TWO
             14 STORE_NAME               0 (x)
             16 STORE_NAME               2 (y)
             18 LOAD_CONST               1 (None)
             20 RETURN_VALUE
>>>
temp = (x + 2, print(x))
x, y = temp
>>> dis.dis('foo, bar, baz, bang  = bang, baz, bar, foo')
  1           0 LOAD_NAME                0 (bang)
              2 LOAD_NAME                1 (baz)
              4 LOAD_NAME                2 (bar)
              6 LOAD_NAME                3 (foo)
              8 BUILD_TUPLE              4
             10 UNPACK_SEQUENCE          4
             12 STORE_NAME               3 (foo)
             14 STORE_NAME               2 (bar)
             16 STORE_NAME               1 (baz)
             18 STORE_NAME               0 (bang)
             20 LOAD_CONST               0 (None)
             22 RETURN_VALUE
>>>
x, y = y, x
x = y
y = x


Share : facebook icon twitter icon

Python why variable and return show difference value from print variable?


By : Sundar Raja94
Date : March 29 2020, 07:55 AM
Any of those help One is the repr() representation of the string, the other the printed string. The representation you can paste back into the interpreter to make the same string again.
The Python interactive prompt always uses repr() when echoing variables, print always uses the str() string representation.
code :
>>> "'\\x04\\x00\\x00\\x00\\x00\\x00\\x00\\x00g\\xc4|\\x00\\x00\\x00\\x00\\x00'"
"'\\x04\\x00\\x00\\x00\\x00\\x00\\x00\\x00g\\xc4|\\x00\\x00\\x00\\x00\\x00'"
>>> print "'\\x04\\x00\\x00\\x00\\x00\\x00\\x00\\x00g\\xc4|\\x00\\x00\\x00\\x00\\x00'"
'\x04\x00\x00\x00\x00\x00\x00\x00g\xc4|\x00\x00\x00\x00\x00'
>>> print repr("'\\x04\\x00\\x00\\x00\\x00\\x00\\x00\\x00g\\xc4|\\x00\\x00\\x00\\x00\\x00'")
"'\\x04\\x00\\x00\\x00\\x00\\x00\\x00\\x00g\\xc4|\\x00\\x00\\x00\\x00\\x00'"

User defined PHP function fails to return updated variable


By : s.roga
Date : March 29 2020, 07:55 AM
seems to work fine I am having some difficulty finding anything quite similar to what I am trying to accomplish with my code. I have a while loop that executes for each instance of a variable located in a mysql database. , try changing
function postcode($partnum,$lqty)

python can't return a variable but can print


By : user2460757
Date : March 29 2020, 07:55 AM
This might help you You are doing recursive calls to subset_sum, but you are not passing the returned value from the subcall to the caller.
If you add a return statement in the loop for recursive calls, you get what you are searching for, if the subcall found something.
code :
def findFourPlus(itemCount, seq, goal):
    goalDifference = float("inf")
    closestPartial = []
    hello = subset_sum(itemCount, seq, goal, 0, closestPartial, partial=[])
    return hello #doesn't return value from subset_sum()

def subset_sum(itemCount, seq, goal, goalDifference, closestPartial, partial):
    s = sum(partial)

    # check if the partial sum is equals to target
    if(len(partial) == itemCount):
        if s == goal:
                print("FOUND YAA")
                return partial #right now doesn't return anything. I intend for it to break out of this function as soon as it finds one pair of solution. 


        else:
            if( abs(goal - s) <= goalDifference):
                #print(abs(goal-s), goalDifference, closestPartial)
                goalDifference = abs(goal - s)
                closestPartial[:] = partial
                #print(abs(goal-s), goalDifference, closestPartial)
                return closestPartial

    for i in range(len(seq)):
        n = seq[i]
        remaining = seq[i+1:]
        t = subset_sum(itemCount, remaining, goal, goalDifference, closestPartial, partial + [n])
        print t
        if t:
            return t

a = findFourPlus(2, [1,2,3,4,5], 6)
print "a=", a
None
None
None
None
None
None
None
None
None
None
None
None
None
None
FOUND YAA
[1, 5]
[1, 5]
a= [1, 5]

python, functions in general: return string and print function OR just print statement in function?


By : JEONG WooHo
Date : March 29 2020, 07:55 AM
With these it helps Definitely have the function return the string and print as late as possible!
Printing early would violate the open-closed principle. That is, in general your code should strive to be closed to modification. This ensures that if you decide, later, that you want to print the string output twice, or pass the string output to an API, or save the string output in a file, you don't have to modify the original code which puts together the string (the book.show_cache function)
code :
def print_cache():
  print book.show_cache()

def save_cache_to_file():
  save(book.show_cache())

def search_google_for_cache():
  // google.search(book.show_cache())
def print_cache():
  vocab = ['hola', 'como', 'estas', 'bien', 'y', 'tu']
  // more code?
  print vocab

def save_cache_to_file():
  vocab = ['hola', 'como', 'estas', 'bien', 'y', 'tu']
  // more code?
  save(book.show_cache())

def search_google_for_cache():
  vocab = ['hola', 'como', 'estas', 'bien', 'y', 'tu']
  // more code?
  // google.search(vocab)

How can I print more than one variable in my print function(Python)?


By : Jan-Niklas
Date : March 29 2020, 07:55 AM
will help you I'm brand new to python and my teacher showed me an example on how to write multiple variables in a print function but I am getting a syntax error. Did I write it wrong? How can I fix this? , Use this code.
code :
def fahrenheit_to_celcius(num):
    celciusTemp=(num-32)*0.556
    print("When you convert %s to celcius the result is %s" % (num, 
celciusTemp))
Related Posts Related Posts :
  • Get mongod rs.status() results from a python script
  • ImportError: C extension: No module named 'parsing' not built
  • python pandas update column values related to previous updated row during iteration over it
  • 3 nested loops: Optimizing a simple simulation for speed
  • Assign subset of values to pandas dataframe with MultiIndex
  • How to group two sets of buttons on each top corner of the screen using Tkinter?
  • django login using class based for custom user
  • MRJob sort reducer output
  • Python Pandas Counts using rolling time window
  • Getting or editing a string from a column in a csv file with pandas
  • Python - Delete row in matrix/array if row contains
  • Using dicom Images with OpenCV in Python
  • Odoo ghost record
  • Creating and assigning multiple variables in a tkinter application
  • Graph dictionary
  • No changes to original dataframe after applying loop
  • AUC of Random forest model is lower after tuning parameters using hypergrid search and CV with 10 folds
  • Python: Reading multiple CSV files, and assigning each to a different variable
  • How to identify empty rectangle using OpenCV
  • How to iterate multilevel dataframe in python
  • How to limit the contour plot with a line plot?
  • Why subclassing a str or int behaves differently from subclising a list or dict?
  • Python decode with translation table
  • i need to click unordered links in the below URL using selenium, python
  • How to join pandas dataframe with itself?
  • How to apply a color cast to a video frame in OpenCV Python?
  • Is there any existing library for median filtering with kernel size greater then 5 using OpenCL acceleration in python?
  • Changing the color of points in scatter plot for different dummy values
  • Calculate center for each polygon in a list efficiently
  • Loading modules in the same Python package
  • replacing pixels in an imagewith pixels from another image python
  • Suggestion on picking the best options of two lists (minimum and maximum )python
  • Resetting Index in a Dataframe drops the Indexed column by 1 row
  • Convert number which are str from readlines to digits - python
  • Unable to authenitcate with python minds api
  • Print variables from a query in python
  • Ipython does not see the installed library
  • Javascript-like array-method chaining in Python?
  • PyQT: Get contents CustFormWidgetIem inside QListWidgetItem
  • Bottle server: HTTPResponse vs bottle.response
  • pytorch vgg model test on one image
  • Runtime scope and `main` symbol is different inside or outside a function
  • Use anaconda in pycharm (Import libraries error, updating anaconda and virtual environment)
  • how to get the sum of a CSV column list to print
  • Python plot drop lines with repeating value in column
  • receive binary file from POST request with BaseHTTPRequestHandler
  • D-Bus - 'ServiceUnknown' exception encountered while calling a remote procedure
  • Pandas .min() method doesn't seem fastest
  • Pandas: How to reference columns of structure: ('Name', n) ('Name', n+1)
  • Read a text file and remove all characters except alphabets & spaces in Python
  • Compute all powerset intersections of two lists
  • Applying literal_eval on string of lists of POS tags gives ValueError
  • Modelling a logic puzzle
  • What is the meaning of Copy_X in sklearn linear models
  • selenium.common.exceptions.ElementNotInteractableException: Message: Element is not displayed
  • pydev debugger does not stop in breakpoint
  • Python windows path regex
  • Flask and selenium-hub are not communicating when dockerised
  • How to use groupby on a single column and perform comparisons for multiple columns in Pandas?
  • Locate a python script without absolute path
  • shadow
    Privacy Policy - Terms - Contact Us © voile276.org