python的sum函数怎么用 python sum函数怎么用
python\u7684sum\u51fd\u6570\u600e\u4e48\u7528sum(iterable[, start]) \uff0citerable\u4e3a\u53ef\u8fed\u4ee3\u5bf9\u8c61\uff0c\u5982\uff1a
sum([ ], start) \uff0c #iterable\u4e3alist\u5217\u8868\u3002
sum(( ), start ) \uff0c #iterable\u4e3atuple\u5143\u7ec4\u3002
\u6700\u540e\u7684\u503c=\u53ef\u8fed\u4ee3\u5bf9\u5e94\u91cc\u9762\u7684\u6570\u76f8\u52a0\u7684\u503c + start\u7684\u503c
start\u9ed8\u8ba4\u4e3a0\uff0c\u5982\u679c\u4e0d\u5199\u5c31\u662f0\uff0c\u4e3a0\u65f6\u53ef\u4ee5\u4e0d\u5199\uff0c\u5373sum()\u7684\u53c2\u6570\u6700\u591a\u4e3a\u4e24\u4e2a\uff0c\u5176\u4e2d\u7b2c\u4e00\u4e2a\u5fc5\u987b\u4e3aiterable\u3002
\u6309\u7167\u60ef\u4f8b\uff0c\u5728\u5f00\u53d1\u8bed\u8a00\u4e2d\uff0csum\u51fd\u6570\u662f\u6c42\u548c\u51fd\u6570\uff0c\u6c42\u591a\u4e2a\u6570\u636e\u7684\u548c\uff0c\u800c\u5728python\u4e2d\uff0c\u867d\u7136\u4e5f\u662f\u6c42\u548c\u51fd\u6570\uff0c\u4f46\u7a0d\u5fae\u6709\u4e9b\u5dee\u522b\uff0csum()\u4f20\u5165\u7684\u53c2\u6570\u5f97\u662f\u53ef\u8fed\u4ee3\u5bf9\u8c61\uff08\u6bd4\u5982\u5217\u8868\u5c31\u662f\u4e00\u4e2a\u53ef\u8fed\u4ee3\u5bf9\u8c61\uff09\uff0c\u8fd4\u56de\u8fd9\u4e2a\u88ab\u4f20\u5165\u53ef\u8fed\u4ee3\u5bf9\u8c61\u5185\u53c2\u6570\u7684\u548c\u3002
\u6bd4\u5982\uff1a
sum\u662fpython\u4e2d\u4e00\u4e2a\u5f88\u5b9e\u7528\u7684\u51fd\u6570\uff0c\u4f46\u662f\u8981\u6ce8\u610f\u5b83\u7684\u4f7f\u7528\uff0c\u6211\u7b2c\u4e00\u6b21\u7528\u7684\u65f6\u5019\uff0c\u5c31\u628a\u5b83\u8fd9\u6837\u7528\u4e86\uff1a
s = sum(1,2,3)
\u7ed3\u679c\u5c31\u60b2\u5267\u5566
\u5176\u5b9esum()\u7684\u53c2\u6570\u662f\u4e00\u4e2alist
\u4f8b\u5982\uff1a
sum([1,2,3])
sum(range(1,11))
\u8fd8\u6709\u4e00\u4e2a\u6bd4\u8f83\u6709\u610f\u601d\u7684\u7528\u6cd5
a = range(1,11)
b = range(1,10)
c = sum([item for item in a if item in b])
print c
\u8f93\u51fa\uff1a
45
实例
以下展示了使用 sum 函数的实例：
>>> sum([1,2])
3
>>> sum([1,2],3)
6
>>>
>>> sum((2, 3, 4), 1) # 元组计算总和后再加 1
10
>>> sum([0,1,2,3,4], 2) # 列表计算总和后再加 2
12
绛旓細鍦≒ython绛夌紪绋嬭瑷涓紝sum鍑芥暟鏄竴涓潪甯稿疄鐢ㄧ殑鍐呯疆鍑芥暟锛岀敤浜庤绠椾竴绯诲垪鏁板肩殑鎬诲拰銆傚叾鍩烘湰璇硶濡備笅锛歴um(iterable[, start])鍏朵腑锛宨terable鏄竴涓彲杩唬瀵硅薄锛屽鍒楄〃銆佸厓缁勬垨闆嗗悎锛屽寘鍚渶瑕佹眰鍜岀殑鏁板硷紱start鏄竴涓彲閫夊弬鏁帮紝琛ㄧず姹傚拰鐨勮捣濮嬪硷紝榛樿涓0銆備緥濡傦紝鏈変竴涓寘鍚嫢骞叉暣鏁扮殑鍒楄〃锛屽彲浠ヨ繖鏍蜂娇鐢╯u...
绛旓細```python 鐢熸垚 1 鍒 100 鐨勬暟瀛楀簭鍒 sequence = range(1, 101)浣跨敤 sum() 鍑芥暟璁＄畻搴忓垪鐨勫拰 total = sum(sequence)杈撳嚭缁撴灉 print("1 鑷 100 鐨勫拰涓猴細", total)```鍦ㄨ繖涓ず渚嬩腑锛宍range(1, 101)` 鍑芥暟鐢ㄤ簬鐢熸垚 1 鍒 100 鐨勬暟瀛楀簭鍒楋紝`sum()` 鍑芥暟鐢ㄤ簬璁＄畻搴忓垪鐨勫拰锛屾渶鍚庡皢缁撴灉杈撳嚭銆
绛旓細sum(( ), start ) 锛 #iterable涓簍uple鍏冪粍銆傛渶鍚庣殑鍊=鍙凯浠ｅ搴旈噷闈㈢殑鏁扮浉鍔犵殑鍊 + start鐨勫 start榛樿涓0锛屽鏋滀笉鍐欏氨鏄0锛屼负0鏃跺彲浠ヤ笉鍐欙紝鍗硈um()鐨勫弬鏁版渶澶氫负涓や釜锛屽叾涓涓涓繀椤讳负iterable銆傛寜鐓ф儻渚嬶紝鍦ㄥ紑鍙戣瑷涓紝sum鍑芥暟鏄眰鍜屽嚱鏁帮紝姹傚涓暟鎹殑鍜岋紝鑰屽湪python涓锛岃櫧鐒朵篃鏄眰鍜屽嚱鏁...
绛旓細鏂规硶涓锛浣跨敤sum()鍑芥暟鍜宭en()鍑芥暟鐐瑰嚮瀛︿範澶у巶鍚嶅笀绮惧搧璇捐繖鏄疨ython涓渶绠鍗曠殑涓绉嶆柟娉曟潵姹傚钩鍧囨暟銆傚彲浠浣跨敤Python鐨剆um()鍑芥暟灏嗗垪琛ㄦ垨鏁版嵁涓殑鍏冪礌姹傚拰锛岀劧鍚庝娇鐢╨en()鍑芥暟姹傚嚭鍏冪礌鏁伴噺锛屾渶鍚庡皢鎬诲拰闄や互鍏冪礌鏁伴噺鍗冲彲寰楀埌骞冲潎鍊笺傛柟娉曚簩锛氫娇鐢╯tatistics搴揚ython涓殑statistics搴撴彁渚涗簡澶氱缁熻瀛﹀嚱鏁帮紝姣斿m...
绛旓細浣跨敤sum()鍜宭en()鍑芥暟锛岃绠楀钩鍧囧 瀹氫箟涓涓垪琛 lst = [1, 2, 3, 4, 5]浣跨敤sum()鍜宭en()鍑芥暟璁＄畻骞冲潎鍊 average = sum(lst) / len(lst)杈撳嚭缁撴灉 print("骞冲潎鍊间负锛", average)
绛旓細Python涓锛sum()鏄竴涓唴缃鍑芥暟锛岀敤浜庡鍙凯浠ｅ璞′腑鐨勬墍鏈夊厓绱犺繘琛屾眰鍜屻傝繖涓嚱鏁板彲浠ユ帴鍙楀涓弬鏁帮紝鍏朵腑绗竴涓弬鏁版槸鍙凯浠ｅ璞★紝鑰屽叾浠栧弬鏁板垯鏄彲閫夌殑銆浣跨敤瀹冩椂闇瑕佹敞鎰忥紝瀹冨彧閫傜敤浜庢暟瀛楃被鍨嬬殑鏁版嵁锛屽鏋滆凯浠ｅ璞′腑鍚湁鍏朵粬绫诲瀷鐨勫硷紝鍒欎細鎶涘嚭TypeError寮傚父銆傞櫎浜嗗彲浠ョ敤浜庡簭鍒楃被鍨嬬殑鏁版嵁澶栵紝sum()鍑芥暟涔...
绛旓細涓嬮潰鏄 Python 浠ｇ爜瀹炵幇:涓婅堪浠ｇ爜涓紝棣栧厛瀹氫箟浜嗕竴涓鍑芥暟 calculate(),璇ュ嚱鏁版帴鏀朵竴涓暣鏁板弬鏁 n,鐢ㄤ簬璁＄畻浠 1 鍒 n 鐨勫拰銆傚嚱鏁板唴閮浣跨敤涓涓惊鐜绠椾粠 1 鍒 n 鐨勬墍鏈夋暟瀛楃殑鍜岋紝骞惰繑鍥炶绠楃粨鏋溿傜劧鍚庤皟鐢ㄨ鍑芥暟锛屼紶鍏 n=100锛岃緭鍑鸿绠楃粨鏋溿
绛旓細sum鏄竴涓鍑芥暟锛屽sum锛坸锛寉锛寊锛夛紝鎷彿閲岀殑鍙傛暟浣滄眰鍜岀殑浣滅敤-->x+y+z銆備竴銆佸尯鍩熸眰鍜岋紝棣栧厛鎴戜滑姹傚拰鍖哄煙鐨勪笅鏂硅緭鍏ュ叕寮=SUM锛圔3.B8锛夛紝鍥炶溅鍚庡悜鍙虫嫋鎷斤紝瀹屾垚姹傚拰銆傛垨鑰呮垜浠夊彇闇瑕佹眰鍜岀殑鍖哄煙鍚庢寜蹇嵎閿瓵lt+=锛屼篃鍙互蹇熺殑瀹屾垚姹傚拰銆備簩銆佷笉杩炵画鐨勫尯鍩燂紝涓嶈繛缁殑鍖哄煙杩涜姹傚拰鍛紝鎴戜滑杈撳叆鍏紡=SUM...
绛旓細4銆浣跨敤Python涓殑for寰幆鍜宨f璇彞鍙互璁＄畻50鍒100涓鏁扮殑鍜屽拰鍋舵暟鐨勫拰銆5銆乸ython3鐢ㄥ垪琛ㄦ帹瀵煎紡鍒涘缓涓涓厓绱犱负1~1000闂存墍鏈夊伓鏁扮殑鍒楄〃锛岀劧鍚鐢╯um()鍑芥暟杈撳嚭鍒楄〃鍏冪礌鎬诲拰銆傜洿鎺ョ敤寰幆鏉ョ疮鍔犮俻ython缂栧啓1鍒100鎵鏈夊伓鏁板拰鍏蜂綋瑙ｉ鎬濊矾濡備笅锛屼娇鐢╢or寰幆杩涜閬嶅巻锛屽悓鏃朵娇鐢ㄦā杩愮畻鍒ゆ柇鍋舵暟銆傚叿浣撲唬鐮佸涓嬫墍绀...
绛旓細棣栧厛杈撳叆瑕佹眰鍜岀殑椤规暟 n銆傛帴鐫锛浣跨敤涓涓惊鐜亶鍘嗘暟鍒楃殑鍓 n 椤癸紝璁＄畻姣忎竴椤圭殑鍊硷紝骞跺皢姣忎竴椤瑰姞鍒版暟鍒楃殑鍜 sum 涓銆傛渶鍚庤緭鍑烘暟鍒楃殑鍜屻傛敞鎰弉蹇呴』涓哄ぇ浜庢垨绛変簬1鐨勬暣鏁帮紝鍦ㄨ繖涓暟鍒椾腑锛屾瘡涓椤圭殑鍒嗘瘝閮芥槸姣斿垎瀛愬ぇ 1锛屽洜姝ゅ彲浠ョ洿鎺ヤ娇鐢 i 鍜 i+1 鏉ヨ绠楁暟鍒楃殑绗 i 椤广
