{"id":324,"date":"2020-02-22T16:18:24","date_gmt":"2020-02-22T08:18:24","guid":{"rendered":"https:\/\/www.linuxmi.com\/?p=324"},"modified":"2020-02-22T16:18:24","modified_gmt":"2020-02-22T08:18:24","slug":"python-while-xunhuan","status":"publish","type":"post","link":"https:\/\/www.linuxmi.com\/python-while-xunhuan.html","title":{"rendered":"Python while \u5faa\u73af\u8bed\u53e5\u4f7f\u7528\u8be6\u89e3"},"content":{"rendered":"

\u5faa\u73af\u662f\u7f16\u7a0b\u8bed\u8a00\u7684\u57fa\u672c\u6982\u5ff5\u4e4b\u4e00\u3002\u5f53\u60a8\u5e0c\u671b\u591a\u6b21\u91cd\u590d\u7279\u5b9a\u7684\u4ee3\u7801\u5757\uff0c\u76f4\u5230\u6ee1\u8db3\u7ed9\u5b9a\u7684\u6761\u4ef6\u65f6\uff0c\u5faa\u73af\u975e\u5e38\u65b9\u4fbf\u3002Python\u4e2d\u6709\u4e24\u4e2a\u57fa\u672c\u7684\u5faa\u73af\u6784\u9020\uff0cfor\u548cwhile\u5faa\u73af\u3002<\/p>\n

\u672c\u6559\u7a0b\u4ecb\u7ecd\u4e86Python\u4e2dwhile\u5faa\u73af\u7684\u57fa\u7840\u3002 \u6211\u4eec\u8fd8\u5c06\u5411\u60a8\u5c55\u793a\u5982\u4f55\u4f7f\u7528else\u5b50\u53e5\u4ee5\u53cabreak\u548ccontinue\u8bed\u53e5\u3002<\/p>\n

Python while\u5faa\u73af<\/strong><\/p>\n

\u53ea\u8981\u7ed9\u5b9a\u6761\u4ef6\u7684\u503c\u4e3atrue, while\u5faa\u73af\u5c31\u4f1a\u6267\u884c\u672a\u77e5\u6b21\u6570\u7684\u8bed\u53e5\u3002<\/p>\n

Python while\u5faa\u73af\u91c7\u7528\u4ee5\u4e0b\u5f62\u5f0f\uff1a<\/p>\n

while EXPRESSION:
\nSTATEMENT(S)<\/p>\n

while\u8bed\u53e5\u4ee5while\u5173\u952e\u5b57\u5f00\u5934\uff0c\u540e\u8ddf\u6761\u4ef6\u8868\u8fbe\u5f0f\u3002<\/p>\n

\u5728\u6267\u884c\u8bed\u53e5\u4e4b\u524d\u5148\u8bc4\u4f30EXPRESSION\u3002 \u5982\u679c\u6761\u4ef6\u8bc4\u4f30\u4e3a\u771f\uff0c\u5219\u6267\u884cSTATEMENT(S)\u3002 \u5426\u5219\uff0c\u5982\u679c\u6761\u4ef6\u8bc4\u4f30\u4e3afalse\uff0c\u5219\u5faa\u73af\u7ec8\u6b62\uff0c\u5e76\u5c06\u7a0b\u5e8f\u63a7\u5236\u4f20\u9012\u7ed9\u540e\u9762\u7684\u8bed\u53e5\u3002<\/p>\n

STATEMENT(S)\u5757\u4ee5\u7f29\u8fdb\u5f00\u59cb\uff0c\u4ee5\u7b2c\u4e00\u6761\u672a\u7f29\u8fdb\u7684\u884c\u7ed3\u675f\u3002 \u5927\u591a\u6570\u4eba\u9009\u62e9\u4f7f\u75284\u7a7a\u683c\u8fd8\u662f2\u7a7a\u683c\u7f29\u8fdb\u3002 \u5b98\u65b9\u7684Python\u4ee3\u7801\u6837\u5f0f\u6307\u5357\u5efa\u8bae\u6bcf\u4e2a\u7f29\u8fdb\u7ea7\u522b\u4f7f\u75284\u4e2a\u7a7a\u683c\uff0c\u5e76\u907f\u514d\u6df7\u5408\u4f7f\u7528\u5236\u8868\u7b26\u548c\u7a7a\u683c\u8fdb\u884c\u7f29\u8fdb\u3002<\/p>\n

\u8ba9\u6211\u4eec\u770b\u4e0b\u9762\u7684\u793a\u4f8b\u4ee3\u7801\uff0c\u53ea\u8981\u5b83\u5c0f\u4e8e5\uff0c\u5c31\u9012\u589e\u5e76\u6253\u5370\u53d8\u91cfi\u7684\u5f53\u524d\u503c\uff1a<\/p>\n

>>> i=0
\n>>> while i < 5:
\n…\u00a0 \u00a0 i += 1
\n…\u00a0 \u00a0 print(‘number:’, i)
\n…<\/p>\n

\u53ea\u8981i\u5c0f\u4e8e\u6216\u7b49\u4e8e5\uff0cTue\u5faa\u73af\u5c31\u4f1a\u8fed\u4ee3\u3002 \u5b83\u5c06\u4ea7\u751f\u4ee5\u4e0b\u8f93\u51fa\uff1a<\/p>\n

number: 1
\nnumber: 2
\nnumber: 3
\nnumber: 4
\nnumber: 5<\/p>\n

$\"\"$ <\/p>\n

Python\u652f\u6301\u6807\u51c6\u7684\u6bd4\u8f83\u64cd\u4f5c:<\/p>\n

\n
a == b – \u5982\u679ca\u548cb\u76f8\u7b49\uff0c\u5219\u4e3atrue\u3002<\/li>\n
a != b – \u5982\u679ca\u548cb\u4e0d\u76f8\u7b49\uff0c\u5219\u4e3atrue\u3002<\/li>\n
a > b – \u5982\u679ca\u5927\u4e8eb\uff0c\u5219\u4e3atrue\u3002<\/li>\n
a >= b – \u5982\u679ca\u7b49\u4e8e\u6216\u5927\u4e8eb\uff0c\u5219\u4e3atrue\u3002<\/li>\n
a < b – \u5982\u679ca\u5c0f\u4e8eb\uff0c\u5219\u4e3atrue\u3002<\/li>\n
a <= b – \u5982\u679ca\u7b49\u4e8e\u6216\u5c0f\u4e8eb\uff0c\u5219\u4e3atrue\u3002<\/li>\n<\/ul>\n
\u8981\u5426\u5b9a\u6761\u4ef6\u8868\u8fbe\u5f0f\uff0c\u8bf7\u4f7f\u7528\u903b\u8f91not\u8fd0\u7b97\u7b26\uff1a<\/p>\n
>>> i=0
\n>>> while not i >= 5:
\n…\u00a0 \u00a0 i += 1
\n…\u00a0 \u00a0 print(‘number:’, i)
\n…<\/p>\n
number: 1
\nnumber: 2
\nnumber: 3
\nnumber: 4
\nnumber: 5<\/p>\n
$\"\"$ <\/p>\n
break\u548ccontinue\u8bed\u53e5<\/strong><\/p>\n
break\u548ccontinue\u8bed\u53e5\u4f7f\u60a8\u53ef\u4ee5\u63a7\u5236while\u5faa\u73af\u7684\u6267\u884c\u3002<\/p>\n
break\u8bed\u53e5\u7ec8\u6b62\u5f53\u524d\u5faa\u73af\uff0c\u5e76\u5c06\u7a0b\u5e8f\u63a7\u5236\u6743\u4f20\u9012\u7ed9\u7ec8\u6b62\u5faa\u73af\u4e4b\u540e\u7684\u8bed\u53e5\u3002 \u6700\u5e38\u89c1\u7684\u60c5\u51b5\u662f\u5728\u6ee1\u8db3\u7279\u5b9a\u6761\u4ef6\u65f6\u4f7f\u7528break\u7ec8\u6b62\u5faa\u73af\u3002<\/p>\n
\u5728\u4e0b\u9762\u7684\u793a\u4f8b\u4e2d\uff0c\u4e00\u65e6\u5f53\u524d\u8fed\u4ee3\u9879\u7b49\u4e8e2\uff0c\u5219\u5faa\u73af\u7684\u6267\u884c\u5c06\u4e2d\u65ad\u3002<\/p>\n
>>> i=0
\n>>> while i < 5:
\n…\u00a0 \u00a0 i += 1
\n…\u00a0 \u00a0 if i == 2:
\n…\u00a0 \u00a0 \u00a0 \u00a0 break
\n…\u00a0 \u00a0 print(‘number:’, i)
\n…<\/p>\n
\u8f93\u51fa\uff1a<\/p>\n
number: 1<\/p>\n
$\"\"$ <\/p>\n
Continue\u8bed\u53e5\u9000\u51fa\u5faa\u73af\u7684\u5f53\u524d\u8fed\u4ee3\uff0c\u5e76\u5c06\u7a0b\u5e8f\u63a7\u5236\u4f20\u9012\u7ed9\u5faa\u73af\u7684\u4e0b\u4e00\u4e2a\u8fed\u4ee3\u3002<\/p>\n
\u5728\u4e0b\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\u4e00\u65e6\u5f53\u524d\u8fed\u4ee3\u7684\u9879\u76ee\u7b49\u4e8e2\uff0c\u5219continue\u8bed\u53e5\u5c06\u4f7f\u6267\u884c\u8fd4\u56de\u5230\u5faa\u73af\u7684\u5f00\u5934\u5e76\u7ee7\u7eed\u4e0b\u4e00\u6b21\u8fed\u4ee3\u3002<\/p>\n
>>> i=0
\n>>> while i < 5:
\n…\u00a0 \u00a0 i += 1
\n…\u00a0 \u00a0 if i == 2:
\n…\u00a0 \u00a0 \u00a0 \u00a0 continue
\n…\u00a0 \u00a0 print(‘number:’, i)
\n…<\/p>\n
\u8f93\u51fa\uff1a<\/p>\n
number: 1
\nnumber: 3
\nnumber: 4
\nnumber: 5<\/p>\n
$\"\"$ <\/p>\n
else\u5b50\u53e5<\/strong><\/p>\n
\u4e0e\u5176\u4ed6\u8bed\u8a00\u4e0d\u540c\uff0c\u5728Python\u4e2d\uff0cwhile\u5faa\u73af\u5177\u6709\u53ef\u9009\u7684else\u5b50\u53e5\uff1a<\/p>\n
while EXPRESSION:
\nSTATEMENT(S)
\nelse:
\nSTATEMENT(S)<\/p>\n
\u4ec5\u5f53EXPRESSION\u7684\u8ba1\u7b97\u7ed3\u679c\u4e3afalse\u65f6\uff0c\u624d\u4f1a\u6267\u884celse\u5b50\u53e5\u4e2d\u7684\u8bed\u53e5\u3002 \u5982\u679c\u5f15\u53d1\u5f02\u5e38\uff0c\u6216\u8005\u5faa\u73af\u4ee5break\u8bed\u53e5\u7ec8\u6b62\uff0c\u5219\u5c06\u4e0d\u4f1a\u6267\u884c\u8be5\u5f02\u5e38\u3002<\/p>\n
\u8fd9\u662f\u4e00\u4e2a\u4f8b\u5b50\uff1a<\/p>\n
>>> i=0
\n>>> while i < 5:
\n…\u00a0 \u00a0 i += 1
\n…\u00a0 \u00a0 print(‘number:’, i)
\n… else:
\n…\u00a0 \u00a0 print(‘Loop completed.’)
\n…<\/p>\n
\u8f93\u51fa\uff1a<\/p>\n
number: 1
\nnumber: 2
\nnumber: 3
\nnumber: 4
\nnumber: 5
\nLoop completed.<\/p>\n
$\"\"$ <\/p>\n
\u73b0\u5728\u770b\u770b\u52a0\u5165break\u8bed\u53e5\u540e\u7684\uff1a<\/p>\n
>>> i=0
\n>>> while i < 5:
\n…\u00a0 \u00a0 i += 1
\n…\u00a0 \u00a0 if i == 2:
\n…\u00a0 \u00a0 \u00a0 \u00a0 break
\n…\u00a0 \u00a0 print(‘number:’, i)
\n… else:
\n…\u00a0 \u00a0 print(‘Loop completed.’)
\n…<\/p>\n
else\u5b50\u53e5\u4e2d\u7684\u8bed\u53e5\u4e0d\u6267\u884c\uff0c\u56e0\u4e3a\u8868\u8fbe\u5f0f\u7684\u503c\u6ca1\u6709\u4e3afalse:<\/p>\n
number: 1<\/p>\n
$\"\"$ <\/p>\n
\u5e26while\u5faa\u73af\u7684else\u5b50\u53e5\u4e0d\u7ecf\u5e38\u4f7f\u7528\u3002 \u4e00\u79cd\u5e38\u89c1\u7684\u60c5\u51b5\u662f\uff0c\u5f53\u60a8\u5e0c\u671b\u4ece\u5faa\u73af\u4e2d\u4e2d\u65ad\u65f6\uff0c\u5982\u679c\u5faa\u73af\u7ee7\u7eed\u8fd0\u884c\u76f4\u5230\u6761\u4ef6\u8bc4\u4f30\u4e3afalse\uff0c\u5219\u53ef\u4ee5\u6267\u884c\u67d0\u4e9b\u8bed\u53e5\u6216\u51fd\u6570\u3002<\/p>\n
\u65e0\u9650\u00a0while \u5faa\u73af<\/strong><\/p>\n
\u65e0\u9650\u5faa\u73af\u662f\u65e0\u9650\u91cd\u590d\u7684\u5faa\u73af\uff0c\u76f4\u5230\u7a0b\u5e8f\u7ec8\u6b62\u624d\u7ec8\u6b62\u3002 \u5982\u679c\u6761\u4ef6\u59cb\u7ec8\u4e3a\u771f\uff0c\u5219\u5c06\u51fa\u73b0\u65e0\u9650\u5faa\u73af\u3002<\/p>\n
\u65e0\u9650\u5faa\u73af\u901a\u5e38\u7528\u4e8e\u4f7f\u7a0b\u5e8f\u7b49\u5f85\u67d0\u4e9b\u5916\u90e8\u4e8b\u4ef6\u7684\u53d1\u751f\u3002 \u901a\u5e38\uff0c\u5728Python\u4e2d\uff0c\u4f7f\u7528while True\u521b\u5efa\u65e0\u9650\u5faa\u73af\uff1a\u9664\u4e86True\uff0c\u60a8\u8fd8\u53ef\u4ee5\u4f7f\u7528\u59cb\u7ec8\u8fd4\u56detrue\u7684\u4efb\u4f55\u5176\u4ed6\u8868\u8fbe\u5f0f\u3002<\/p>\n
\u8fd9\u662f\u4e00\u4e2a\u65e0\u9650while\u5faa\u73af\u7684\u793a\u4f8b\uff0c\u8be5\u5faa\u73af\u5c06\u7ee7\u7eed\u63d0\u793a\u60a8\u8f93\u5165\u201cYes\u201d\uff1a<\/p>\n
>>> while True:
\n…\u00a0 \u00a0 i = input(‘Please enter \\’Yes\\’: ‘)
\n…\u00a0 \u00a0 if i.strip() == ‘Yes’:
\n…\u00a0 \u00a0 \u00a0 \u00a0 break
\n…<\/p>\n
\u4e0a\u9762\u7684while\u5faa\u73af\u5c06\u4e00\u76f4\u8fd0\u884c\uff0c\u76f4\u5230\u60a8\u8f93\u5165\u201cYes\u201d\uff1a<\/p>\n
Please enter ‘Yes’: 3
\nPlease enter ‘Yes’: 1
\nPlease enter ‘Yes’: linuxmi
\nPlease enter ‘Yes’: linuxmi.com
\nPlease enter ‘Yes’: www.linuxmi.com
\nPlease enter ‘Yes’: Yes<\/p>\n
$\"\"$ <\/p>\n
\u7ec8\u6b62\u65e0\u9650\u5faa\u73af\u7684\u53e6\u4e00\u79cd\u65b9\u6cd5\u662f\u6309CTRL + C\u3002<\/p>\n
\u7f16\u5199\u65e0\u9650\u5faa\u73af\u65f6\uff0c\u8bf7\u786e\u4fdd\u4f7f\u7528break\u8bed\u53e5\u5728\u67d0\u4e2a\u65f6\u523b\u9000\u51fa\u5faa\u73af\u3002<\/p>\n
\u603b\u7ed3<\/strong><\/p>\n
\u53ea\u8981\u7ed9\u5b9a\u6761\u4ef6\u7684\u503c\u4e3atrue\uff0cwhile\u5faa\u73af\u5c31\u4f1a\u91cd\u590d\u6267\u884c\u5176\u8bed\u53e5\u3002<\/p>\n
\u5982\u679c\u60a8\u6709\u4efb\u4f55\u7591\u95ee\u6216\u53cd\u9988\uff0c\u8bf7\u968f\u65f6\u53d1\u8868\u8bc4\u8bba\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5faa\u73af\u662f\u7f16\u7a0b\u8bed\u8a00\u7684\u57fa\u672c\u6982\u5ff5\u4e4b\u4e00\u3002\u5f53\u60a8\u5e0c\u671b\u591a\u6b21\u91cd\u590d\u7279\u5b9a\u7684\u4ee3\u7801\u5757\uff0c\u76f4\u5230\u6ee1\u8db3\u7ed9\u5b9a\u7684\u6761\u4ef6\u65f6\uff0c\u5faa\u73af\u975e\u5e38\u65b9\u4fbf\u3002Py …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[4],"tags":[15,16],"class_list":["post-324","post","type-post","status-publish","format-standard","hentry","category-python","tag-python-while","tag-pythonxunhuan"],"aioseo_notices":[],"views":547,"_links":{"self":[{"href":"https:\/\/www.linuxmi.com\/wp-json\/wp\/v2\/posts\/324","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.linuxmi.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.linuxmi.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.linuxmi.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.linuxmi.com\/wp-json\/wp\/v2\/comments?post=324"}],"version-history":[{"count":1,"href":"https:\/\/www.linuxmi.com\/wp-json\/wp\/v2\/posts\/324\/revisions"}],"predecessor-version":[{"id":332,"href":"https:\/\/www.linuxmi.com\/wp-json\/wp\/v2\/posts\/324\/revisions\/332"}],"wp:attachment":[{"href":"https:\/\/www.linuxmi.com\/wp-json\/wp\/v2\/media?parent=324"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.linuxmi.com\/wp-json\/wp\/v2\/categories?post=324"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.linuxmi.com\/wp-json\/wp\/v2\/tags?post=324"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}