{"id":2836,"date":"2025-05-30T17:03:56","date_gmt":"2025-06-04T09:38:56","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=2836"},"modified":"2025-06-04T17:03:56","modified_gmt":"2025-06-04T09:38:56","slug":"%e5%ad%b8%e7%bf%92%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8python%e7%9a%84float%e5%87%bd%e6%95%b8","status":"publish","type":"post","link":"https:\/\/badgameshow.com\/steven\/python\/%e5%ad%b8%e7%bf%92%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8python%e7%9a%84float%e5%87%bd%e6%95%b8\/","title":{"rendered":"2025 \u5e74\u6700\u65b0 Python float() \u51fd\u6578\u6559\u5b78\uff1a\u5be6\u7528\u7bc4\u4f8b\u8207\u6700\u4f73\u5be6\u8e10"},"content":{"rendered":"

<\/p>\n

Python float() \u51fd\u6578\u5b8c\u5168\u6307\u5357<\/h1>\n

\u5728 Python \u4e2d\uff0c`float()` \u51fd\u6578\u662f\u4e00\u500b\u975e\u5e38\u5be6\u7528\u7684\u5de5\u5177\uff0c\u7528\u65bc\u5c07\u5b57\u7b26\u4e32\u6216\u6578\u503c\u8f49\u63db\u70ba\u6d6e\u9ede\u6578\u3002\u9019\u5728\u8655\u7406\u6578\u64da\u6642\u5c24\u5176\u91cd\u8981\uff0c\u56e0\u70ba\u6d6e\u9ede\u6578\u5728\u6578\u5b78\u8a08\u7b97\u4e2d\u5e38\u5e38\u51fa\u73fe\u3002<\/p>\n

\u8a9e\u6cd5<\/h2>\n

“`python
\nfloat(x)
\n“`<\/p>\n

\u53c3\u6578 `x` \u53ef\u4ee5\u662f\u6578\u5b57\u6216\u5b57\u7b26\u4e32\u3002<\/p>\n

\u8fd4\u56de\u503c<\/h2>\n

\u9019\u500b\u51fd\u6578\u8fd4\u56de\u4e00\u500b\u6d6e\u9ede\u6578\uff08float\uff09\u3002<\/p>\n

\u57fa\u672c\u793a\u4f8b<\/h2>\n

\u4ee5\u4e0b\u793a\u4f8b\u5c55\u793a\u4e86 `float()` \u51fd\u6578\u7684\u57fa\u672c\u7528\u6cd5\uff1a<\/p>\n

“`python
\n# \u6578\u5b57
\nprint(float(10)) # \u8f38\u51fa: 10.0<\/p>\n

# \u5b57\u7b26\u4e32
\nprint(float(“-20.5”)) # \u8f38\u51fa: -20.5
\n“`<\/p>\n

\u57f7\u884c\u4ee5\u4e0a\u7a0b\u5f0f\uff0c\u8f38\u51fa\u7d50\u679c\u70ba\uff1a<\/p>\n

“`python
\n10.0
\n-20.5
\n“`<\/p>\n

\u61c9\u7528\u5834\u666f<\/h2>\n

`float()` \u51fd\u6578\u53ef\u4ee5\u7528\u65bc\u5c07\u5b57\u7b26\u4e32\u6216\u6578\u503c\u8f49\u63db\u70ba\u6d6e\u9ede\u6578\uff0c\u9019\u5c0d\u65bc\u9032\u884c\u6578\u5b78\u8a08\u7b97\u975e\u5e38\u6709\u7528\u3002\u4f8b\u5982\uff0c\u5728\u8655\u7406\u91d1\u878d\u6578\u64da\u6216\u79d1\u5b78\u8a08\u7b97\u6642\uff0c\u4f7f\u7528\u6d6e\u9ede\u6578\u4f86\u78ba\u4fdd\u8a08\u7b97\u7684\u7cbe\u78ba\u6027\u81f3\u95dc\u91cd\u8981\u3002<\/p>\n

\u9032\u968e\u793a\u4f8b<\/h2>\n

\u4ee5\u4e0b\u793a\u4f8b\u5c55\u793a\u4e86 `float()` \u51fd\u6578\u7684\u66f4\u591a\u7528\u6cd5\uff1a<\/p>\n

“`python
\n# \u5c0f\u6578
\nprint(float(11.22)) # \u8f38\u51fa: 11.22<\/p>\n

# \u6574\u6578
\nprint(float(22)) # \u8f38\u51fa: 22.0<\/p>\n

# \u7a7a\u5b57\u7b26\u4e32
\nprint(float(“”)) # \u8f38\u51fa: 0.0<\/p>\n

# \u7a7a\u5c0d\u8c61
\nprint(float()) # \u8f38\u51fa: 0.0<\/p>\n

# \u7a7a\u5217\u8868
\nprint(float([])) # \u8f38\u51fa: 0.0<\/p>\n

# \u7a7a\u5b57\u5178
\nprint(float({})) # \u8f38\u51fa: 0.0<\/p>\n

# \u7a7a\u5143\u7d44
\nprint(float(())) # \u8f38\u51fa: 0.0<\/p>\n

# \u7a7a\u96c6\u5408
\nprint(float(set())) # \u8f38\u51fa: 0.0
\n“`<\/p>\n

\u57f7\u884c\u4ee5\u4e0a\u7a0b\u5f0f\uff0c\u8f38\u51fa\u7d50\u679c\u70ba\uff1a<\/p>\n

“`python
\n11.22
\n22.0
\n0.0
\n0.0
\n0.0
\n0.0
\n0.0
\n0.0
\n“`<\/p>\n

\u932f\u8aa4\u8655\u7406<\/h2>\n

\u7576\u4f7f\u7528 `float()` \u51fd\u6578\u6642\uff0c\u50b3\u5165\u7684\u53c3\u6578\u5fc5\u9808\u662f\u53ef\u4ee5\u8f49\u63db\u70ba\u6d6e\u9ede\u6578\u7684\u578b\u5225\u3002\u5426\u5247\uff0c\u5c07\u5f15\u767c `ValueError`\u3002\u4f8b\u5982\uff1a<\/p>\n

“`python
\ntry:
\n print(float(“NaN”)) # \u8f38\u51fa: nan
\n print(float(“abc”)) # \u5c07\u5f15\u767c ValueError
\nexcept ValueError as e:
\n print(f”\u932f\u8aa4: {e}”)
\n“`<\/p>\n

\u5728\u6b64\u7bc4\u4f8b\u4e2d\uff0c\u6211\u5011\u793a\u7bc4\u4e86\u5982\u4f55\u6355\u7372\u932f\u8aa4\u4e26\u8655\u7406\u5b83\u5011\u3002\u9019\u5c0d\u65bc\u63d0\u9ad8\u7a0b\u5f0f\u7684\u7a69\u5b9a\u6027\u975e\u5e38\u91cd\u8981\u3002<\/p>\n

\u5ef6\u4f38\u61c9\u7528<\/h2>\n

\u4e86\u89e3 `float()` \u51fd\u6578\u5f8c\uff0c\u60a8\u53ef\u4ee5\u5c07\u5176\u61c9\u7528\u65bc\u6578\u64da\u8655\u7406\u3001\u79d1\u5b78\u8a08\u7b97\u548c\u6578\u64da\u5206\u6790\u7b49\u9818\u57df\u3002\u9019\u662f\u9032\u4e00\u6b65\u5b78\u7fd2 Python \u7684\u91cd\u8981\u57fa\u790e\u3002<\/p>\n

\u6b32\u4e86\u89e3\u66f4\u591a Python \u6559\u5b78\uff0c\u8acb\u53c3\u8003 [vocus.cc \u4e0a\u7684 Python \u8cc7\u6e90](https:\/\/vocus.cc)\u3002<\/p>\n

\u7e3d\u7d50<\/h2>\n

`float()` \u51fd\u6578\u662f Python \u4e2d\u5c07\u5b57\u7b26\u4e32\u6216\u6578\u503c\u8f49\u63db\u70ba\u6d6e\u9ede\u6578\u7684\u57fa\u672c\u5de5\u5177\uff0c\u5b83\u5728\u8a08\u7b97\u4e2d\u626e\u6f14\u8457\u91cd\u8981\u7684\u89d2\u8272\u3002\u638c\u63e1\u5176\u7528\u6cd5\u5c07\u6709\u52a9\u65bc\u60a8\u5728\u6578\u64da\u8655\u7406\u548c\u8a08\u7b97\u4e2d\u66f4\u52a0\u5f97\u5fc3\u61c9\u624b\u3002<\/p>\n

Q&A\uff08\u5e38\u898b\u554f\u984c\u89e3\u7b54\uff09<\/h2>\n

Q1: float() \u51fd\u6578\u53ef\u4ee5\u8655\u7406\u54ea\u4e9b\u985e\u578b\u7684\u8f38\u5165\uff1f<\/h3>\n

A: `float()` \u51fd\u6578\u53ef\u4ee5\u8655\u7406\u6574\u6578\u3001\u6d6e\u9ede\u6578\u3001\u53ef\u8f49\u63db\u70ba\u6d6e\u9ede\u6578\u7684\u5b57\u7b26\u4e32\uff0c\u4ee5\u53ca\u4e00\u4e9b\u7a7a\u8cc7\u6599\u7d50\u69cb\uff08\u5982\u7a7a\u5217\u8868\u3001\u5b57\u5178\u7b49\uff09\u3002<\/p>\n

Q2: \u4f7f\u7528 float() \u6642\u9047\u5230 TypeError \u7684\u539f\u56e0\u662f\u4ec0\u9ebc\uff1f<\/h3>\n

A: \u7576\u50b3\u5165\u7684\u53c3\u6578\u985e\u578b\u4e0d\u6b63\u78ba\u6216\u4e0d\u652f\u63f4\u8f49\u63db\u70ba\u6d6e\u9ede\u6578\u6642\uff0c\u5c07\u5f15\u767c `TypeError`\u3002<\/p>\n

Q3: \u5982\u4f55\u6aa2\u67e5\u6d6e\u9ede\u6578\u662f\u5426\u6709\u6548\uff1f<\/h3>\n

A: \u60a8\u53ef\u4ee5\u4f7f\u7528 `math.isnan()` \u51fd\u6578\u4f86\u6aa2\u67e5\u6d6e\u9ede\u6578\u662f\u5426\u70ba NaN\uff08\u4e0d\u662f\u6578\u5b57\uff09\u3002<\/p>\n

—<\/p>\n","protected":false},"excerpt":{"rendered":"

float()\u51fd\u6578\u53ef\u4ee5\u5c07\u5b57\u7b26\u4e32\u6216\u6578\u503c\u8f49\u63db\u70ba\u6d6e\u9ede\u6578\uff0c\u672c\u6587\u5c07\u4ecb\u7d39\u5982\u4f55\u4f7f\u7528Python\u7684float()\u51fd\u6578\uff0c\u4ee5\u53ca\u5b83\u7684\u57fa\u672c\u7528\u6cd5\u548c\u793a\u4f8b\u3002<\/p>\n","protected":false},"author":1,"featured_media":2518,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[18],"tags":[15],"class_list":["post-2836","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-python","tag-python"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/badgameshow.com\/steven\/wp-content\/uploads\/2022\/12\/DALL\u00b7E-2022-12-28-14.25.55-\u62f7\u8c9d2.png","jetpack-related-posts":[],"jetpack_shortlink":"https:\/\/wp.me\/pcFK27-JK","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/2836","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/comments?post=2836"}],"version-history":[{"count":2,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/2836\/revisions"}],"predecessor-version":[{"id":13024,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/2836\/revisions\/13024"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/media\/2518"}],"wp:attachment":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/media?parent=2836"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/categories?post=2836"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/tags?post=2836"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}