我愿这样做:
for qb in qb_data:
qb_in += " " + qb[0] + " " + ","
加入。 显然,问题在于,加入名单的每个成员都是公正的。 但我在此有一份清单,只需要加入每个清单的第一个要素。
",".join(" %s " % qb[0] for qb in qb_data)
当然,你仍然可以有选择地在你的发端人的言论/名单理解中抽出 st!
例如:
>>> qb_data = [[ 1 , 2 ], [ 3 , 4 ], [ 5 , 6 ], [ 7 , 8 , 9 ]]
>>> ",".join(" %s " % qb[0] for qb in qb_data)
" 1 , 3 , 5 , 7 "
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