python学习——读取染色体长度（四：获取最长染色体的编号）

# 读取fasta

 

# 解析每条序列的长度

chr_len = {'chr1':10,'chr2':20,'chr3':30,'chr4':40,'chr5':15}

 

# 求和

total_len = sum(chr_len.values())

 

# 获取键用keys

for chr in chr_len.keys():

print(chr)

 

# 获取值用values

for len in chr_len.values():

print(len)

 

# 获取键值对用items

for [chr,len] in chr_len.items():

print(chr)

print(len)

 

 

# 求最长染色体编号

max_chr =''

max_len = 0

for [chr,len] in chr_len.items():

if len > max_len:

print('current chr > max chr')

max_chr = chr

max_len = len

elif len == max_len:

print('current chr == max chr')

else:

print('current chr < max chr')

 

# 输出结果

print(total_len)

print(max_len)

print(max_chr)