這個Python循環可以更簡潔地表達嗎？

Question

我遇到，我重構成爲這一些Python代碼V2.7：

for ssid in (ssid for ssid in overlaps 
      if ssid != subseq_id and ssid not in merged): 

但感覺對我來說，應該有表達這種不使用兩個for語句的方法嗎？

Answer 1

你可以使用filter()：

for ssid in filter(lambda s: s != subseq_id and s not in merged, overlaps): 
    # ... 

，或者你可能只是測試在循環：

for ssid in overlaps: 
    if ssid == subseq_id or ssid in merged: 
     continue 
    # ... 

Answer 2

根據數據（順序並不重要，......），你可以使用集合：

excluded = set(merged) 
excluded.add(subseq_id) 
ssids = set(overlaps) - excluded 
for ssid in ssids: 
    ...