{"id":21575,"date":"2022-11-14T07:45:16","date_gmt":"2022-11-14T02:15:16","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-cannot-convert-string-to-float-in-python-3-duplicate\/"},"modified":"2022-11-14T07:45:16","modified_gmt":"2022-11-14T02:15:16","slug":"solved-cannot-convert-string-to-float-in-python-3-duplicate","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-cannot-convert-string-to-float-in-python-3-duplicate\/","title":{"rendered":"[Solved] Cannot convert string to float in Python 3 [duplicate]"},"content":{"rendered":"

[ad_1]
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You’re setting your StringVar’s wrong…<\/p>\n

textvariable = \"self.var\" + str(x)\n<\/code><\/pre>\n
This is just a string. Not a reference to the StringVar.<\/p>\n
In your calc<\/code> function you’re doing this:<\/p>\n
 >>> float('')\n Traceback (most recent call last):\n  File \"<stdin>\", line 1, in <module>\n ValueError: could not convert string to float:\n<\/code><\/pre>\n
Because your StringVar has no “value” — since the reference to the stringvar wasn’t passed correctly it’s not being updated, it’s by default set to the empty string.<\/p>\n
If you wanted to iteratively get StringVar’s this way… There’s a few options:<\/p>\n
Use __dict__<\/code>:  self.__dict__['var%d' % i]<\/code><\/p>\n
Use getattr<\/code>: getattr(self, 'var%d' % i)<\/code><\/p>\n
Put them in a list \/ tuple and index either. Use  a dict index that, although imo that’s redundant since using self.*<\/code> will make it be in the classes namespace… and you can just use the above.<\/p>\n
Even correctly using your StringVar’s so that they update doesn’t guarantee float conversion… They could still be empty if the Entry is empty…<\/p>\n
You’re also setting your command wrong. command=self.calc()<\/code>. This is calling<\/em> the function and setting what it returns to be the command. Use command=self.calc<\/code><\/p>\n<\/p><\/div>\n
<\/div>\n<\/div>\n
            3<\/span> <\/p><\/div>\n<\/div>\n
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solved Cannot convert string to float in Python 3 [duplicate] <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] You’re setting your StringVar’s wrong… textvariable = “self.var” + str(x) This is just a string. Not a reference to the StringVar. In your calc function you’re doing this: >>> float(”) Traceback (most recent call last): File “<stdin>”, line 1, in <module> ValueError: could not convert string to float: Because your StringVar has no “value” … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[349,768],"class_list":["post-21575","post","type-post","status-publish","format-standard","hentry","category-solved","tag-python","tag-tkinter"],"yoast_head":"\n[Solved] Cannot convert string to float in Python 3 [duplicate] - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-cannot-convert-string-to-float-in-python-3-duplicate\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Cannot convert string to float in Python 3 [duplicate] - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] You’re setting your StringVar’s wrong… textvariable = "self.var" + str(x) This is just a string. Not a reference to the StringVar. In your calc function you’re doing this: >>> float('') Traceback (most recent call last): File "<stdin>", line 1, in <module> ValueError: could not convert string to float: Because your StringVar has no “value” ... 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Not a reference to the StringVar. In your calc function you’re doing this: >>> float('') Traceback (most recent call last): File \"<stdin>\", line 1, in <module> ValueError: could not convert string to float: Because your StringVar has no “value” ... 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