我正在通过非常大的字典列表进行筛选。 kept
是全球名单,它内有大约9000个字典,所有字典都有相同的密钥。我试图删除'M_P'值大于-4.5的每个字典,并且其中有一半以上的字典,所以我创建了一个仅用于他的目的的函数。当我检查它们是否在后面的功能中被全部删除时,仍然有〜3000左右。任何人都可以告诉我为什么会发生这种情况吗?我可以相信这些功能会按我所说的去做吗?Python忽略命令以从列表中删除项目
def removeMag():
countMag = 0
for mag in kept:
if to_float(mag['M_P']) > -4.5:
kept.remove(mag)
countMag += 1
else:
continue
print '\n'
print ' Number of mags > -4.5 actually removed: '
print countMag
def remove_anomalies():
count = 0
count08 = 0
count09 = 0
count01 = 0
countMag = 0
countMagDim = 0
#Want to remove Q* < 15 degrees
for row in kept:
#to_float(kept(row))
#Q* greater than 15
if to_float(row['Q*']) < 15.00:
kept.remove(row)
elif to_float(row['vel']) > 80.00:
kept.remove(row)
elif to_float(row['err']) >= 0.5*to_float(row['vel']):
kept.remove(row)
elif row['log_10_m'] == '?':
kept.remove(row)
#print row
count+=1
elif row['M_P'] == '?':
kept.remove(row)
countMag += 1
elif to_float(row['M_P']) > -4.5:
countMagDim += 1
就在这里,我正在检查它。 ^^^
elif to_float(row['T_j']) < -50.00 or to_float(row['T_j'] > 50.00):
kept.remove(row)
count01 += 1
#make sure beg height is above end height.
elif to_float(row['H_beg']) < to_float(row['H_end']):
kept.remove(row)
#make sure zenith distance is not greater than 90
elif to_float(row['eta_p']) > 90.00:
kept.remove(row)
#Remove extremities hyperbolic orbits
elif (to_float(row['e']) > 2.00 and to_float(row['e']) == 0.00 and to_float(row['a']) == 0.00 and to_float(row['incl']) == 0.00 and to_float(row['omega']) == 0.00 and to_float(row['anode']) == 0.00 and to_float(row['alp_g']) == 0.00 and to_float(row['del_g']) == 0.00 and to_float(row['lam_g']) == 0.00 and to_float(row['bet_g']) == 0.00):
kept.remove(row)
count08+=1
elif to_float(row['q_per']) == 0.00:
kept.remove(row)
count09+=1
elif to_float(row['q_aph']) == 0.00:
kept.remove(row)
count09+=1
else: continue
print 'Number of dicts with ? as mass value:'
print count
print " Number removed with orbital elements condition: "
print count08
print "Number of per or aph equal to 0: "
print count09
print "Number of T_j anomalies: "
print count01
print "Number of Magnitudes removed from '?': "
print countMag
以下的输出是像3000
print "Number of Magnitudes to be removed from too dim: "
print countMagDim
'''
print "\n"
print "log mass values:"
for row2 in kept:
print row2['log_10_mass']
print "\n"
'''
你从清单中移除您当前迭代项目的数组。这会产生一些意想不到的行为。 – Jkdc
https://asmeurersympy.wordpress.com/2009/07/20/modifying-a-list-while-looping-through-it-in-python/ – dbliss
谢谢大家!我不知道这一切,我很感激! – spacedancechimp